Chainsaw piston scoring. Urbicide summed it up pretty good far as why they score.
- Came off a saw with good compression. And sorry for the crappy picture all I had was my iPad. Apr 4, 2023 · #shorts How to check your chainsaw (or other similar small engine) for scoring on the piston! The piston and block shown in the photos came from a MS250 that ran without oil in the gas mix. I forget the other details. All have used the same fuel. worked on alot of 2 stroke motocros bikes. 2011",Just below rings 2. It was just an assumption, so I windowed it and achieved a noticeable gain. ” Piston looked good, but no pics inside cylinder. Scoring can even include discoloration and is readily noticeable. In good used shape. Piston scoring. The rings did have a slight scoring on them. Not sure when they started making them. It’s best to have a digital tachometer on hand to obtain an idea of the engine RPMs when adjusting your high-speed screw. For saws a lot of the time piston cylinder and Rings is one part number and alot less work to just replace everything. 0470"), and their piston dias (2. While disassembling noticed scoring. No call back either. Head Gasket Failure: The head gasket creates a seal between the cylinder head and the engine block. Count it as hearsay, but I read a thread about a bastard saw design that was both made by The kit came with no instructions but the piston has an arrow on it which I would like to confirm indicates the exhaust port just like on the original Stihl piston. Old piston marked B on top and new piston marked AB on top. com Click to expand Jun 17, 2017 · Compression test- put the gauge in, turn the choke off, tie the throttle open and pull the rope until it won't go any higher. Check ring end gap by sliding ring into cylinder, set to at least . There was a technique called "knurling", used on worn out, old time tractor/truck/car pistons. 001"), and the stihl piston would have been loose in Tecomec cyl (0. hlsproparts. That was what the saw was designed and built with, and you know it works. Part of the failure was probably my fault and the other was the piston cylinder quality to start with. They are all the way on the left side of the intake side. Then clean up the cylinder with muriatic acid. Then I tried to remove the clutch on a Stihl MS180 and put a hole in the piston. Anyway I guess I have a couple of options, either put a new cylinder and piston on this saw or buy a new 290 or 390. Brought to dealer and was told it was scored piston. If the piston does contact the top of the combustion chamber when the engine is running, only bad things will follow. How much scoring is too much in cylinder. 16 Cylinder Kit with piston and rings $11. The local repair shop said "not worth fixing", but if I fix it myself, I'm pretty sure I can have it free. I know scoring is not good on any piston but am wonderig can you try to litley Jun 8, 2006 · Rinse it in soapy water, blow dry. So I looked at the piston and it is scored pretty severely (pictures below), I took the chainsaw to a tech and they said it would be pointless to put a new cylinder in and that I should simply buy a new saw and sell the old one for parts. The worn piston was knurled in a lathe, and the raised portions of the knurl took up the extra P/C clearance space. If a saw like that is run when it’s cold outside, it ends up with scoring on the piston like in your pictures Jun 15, 2009 · 920 pistons Just a heads up on pistons. Jan 12, 2022 · The input and exhaust piston surfaces are clean, but the scoring is on both sides above the pin. | Porting Your Chainsaw GUIDE | #chainsaw #cuttingwood Nov 20, 2008 · I took the muffler off my 85 husqvarna 50 the other day to repaint it and noticed that there was some scoring on the exhaust side of the piston. It can be freed with penetrating oil in the cylinder. Mainly, it looks to not have beem worked too hard. There will usually be less scoring than on the exhaust side of a straight gassed piston. Jun 26, 2018 · Ok here it Goes. Jun 17, 2007 · I know this is OT. There is no significant carbon buildup, however. Dec 4, 2006 · The larger saws seem a little easier to see this on, but I suppose that is from the larger piston and thereby a bigger visual field. The piston actually has a little metal ball that sits in the grove. Nov 17, 2009 · Hey guys got a question. Connect the compression tester’s hose to the hole in the spark plug. I've Chainsaws are just like that. All of mine went in the recycle bin. The cylinder looks spotless though. Hey r/chainsaw is this scoring worrisome? I got this Stihl MS311 about 18 months ago used. This article will cover all the essential information about porting a chainsaw to help you make the necessary adjustments for optimal engine performance. much below that and most saws just won't run right, or be difficult or impossible to start when hot because the compression is even lower when hot. Sep 26, 2013 · Hi all, I have a question on some wear on a piston that I was hoping someone could help me out with what is going on and what caused it Disclaimer: This is not a chainsaw piston. All the way around. Had thought afterward (of course) of getting a peice of door screen and forming it over the piston and such and prying the clip from underneath it, kinda like using a rag over it, cept I could see through the screen. 8. I took off the cylinder and looking at it it looks fine. 12 AV Buffer (3) $3. Slip a new piston & ring in it and make sure it slides freely by hand. Any scoring on the surface of a seized piston indicates friction during operation. My time alone, was worth that. When you run your cutting machine for too long or at a high RPM, it generates See full list on yardlifemaster. 64833, 64542, 65297. 1. There’s not much to them. Started by mrcaptainbob on Chainsaws. Bad combination but that's how you learn. Jun 8, 2022 · As far as a scored piston and performance, it will depend on how much and where. I can find the piston kit with no problems, but after 30 minutes of searching for a cylinder kit, I can only find one on eBay for $200. Apr 25, 2012 · Getting ready to install a new piston in my 372xp. Scuffed pistons can be caused by too much heat in the combustion chamber, engine overheating or inadequate lubrication. The piston to cylinder clearance should be checked Oct 16, 2007 · No oil in the mix usually shows scoring all around the piston, but usually worse closer to the exhaust for obvious reasons. Luckily it was quiet in the garage, cause that was the only way I found it. Looking at the piston on the intake side there is 4 or 5 lines that you can feel with your fingernail. Models Feb 28, 2010 · Any type of solder will work, but if you are using some thick solid core plumbers solder it may not flatten/spread and could potentially damage the piston, rod, or bearings if you really try to horse it. pdf. 96 The total with shipping was $31 (10-15 days) Mac&Homelite: Thanks for mentioning Huztl. This is a repository forum and each new thread must contain the manual the thread is about. IIRC, the 044 piston had the ring locating pins in the wrong locations. When I got The saw back there was a tablespoon of water in the bottom of the gas tank. May 2, 2014 · I wouldn't call that excessive. In a twin ring piston the bit of aluminum between the rings snaps off. I cleaned it up several times and it continued to scuff. Looking at the exhaust port, there appears to be scoring on the piston. 2005 Side-Side: Below rings 2. Jan 12, 2012 · Had the same problem Removing the circlip on the 500 Shindaiwa. Do not use a Golf piston! Also, don't over-tighten the cylinder bolts Jun 2, 2012 · The piston on a 084 parts saw i bought has some discoloration perhaps burn marks or carbon build up around one of the rings. Jan 31, 2017 · Over the last 40 years of working servicing saws for logging companys, the piston skirt clearance has been in the 20/25 thou region with a rebuild when wear exceeds 30/32thou the ring clearances have always been set to 4/6thou per 25. Mar 14, 2004 · I'd say that scoring is probably caused by heat 99% of the time and by debris about 1%. i have never felt one ring was aproblem, especialy on stuff smaller than 125cc. 99 USD. If the Feb 7, 2009 · I have a question to some of the experts on here, I go on ebay alot and look at all the cahinsaws and the other day won two off ebay a sthil 032av and a 028 wood boss both look to be a great shape and both stated to have high compression and are running, but my question what can you do to keep from scoring a piston? does this happen because 3. Reason - If the piston to cylinder clearance is too large it allows the piston to rattle inside the cylinder bore, with time the piston develops stress fractures and eventually cracks. $500 repair on a $725 saw. Regardless what caused it those chunks that are missing from the piston are all munched up in your crankcase bearings and you may never get it flushed out clean. Feb 17, 2022 · Hey y'all, I have two ms-261's that are both showing some scorch marks at the top of the piston on the exhaust side. 001". Nov 23, 2011 · Hello, I'm fairly new to chainsaw repair and still learning. Is it always necessary to replace the piston and rings - what about the cylinder, or can you hone it out? In most instances it is better to replace the piston and the rings if both have damage. Nov 19, 2017 · He ruined the piston and cylinder. Lack of lubrication in the oil will typically score the piston all the way around and a lean running condition (not enough fuel or too much air) will typically score the piston just on the exhaust side. The saw is running to spec for idling and Apr 16, 2024 · Scratched or Scored Cylinder Wall: Scratches or scoring on the cylinder wall can prevent the piston rings from forming a proper seal, allowing compressed air and fuel to leak past. Then he said must have overheated. Dec 6, 2007 · Piston stop can poke hole in piston, as the top of the piston is weak. Case 1: Cylinder wall scoring: As a rule of thumb, this value must be more than 100 psi for combustion to begin. Looking at the Madsen's piston failure analysis website it looks like the saw was run with straight unmixed gas. Looking into that got me off on a number of things, part kits Jun 15, 2015 · Bought a used piston and cylinder off a member on here for an 026 assuming they were all the same. I will pressure and vac test befor i am done fixing it. The first rule of Chainsaw Club is, piston scoring. Tweet; Unavailable (0 in stock) $69. I was cutting some 18 inch rounds today (elm and poplar I think) and the saw was zipping right through when the muffler fell off. Feb 2, 2013 · Saw was running exc, comp. Fits: Poulan 3300 poulan 3300 chainsaw piston and cylinder kit. If you want to stop here, you are good to go. When a piston is traveling vertically in a bore, it's motion stabilizes it. Pull the chainsaw cord at least five times and take note of the reading on the tester’s gauge. Depending on the severity of the scoring, the cylinder and piston may need to be replaced. Overall height is the same on both pistons. More contact points would stabilize this motion. Work is underway on a color version by another member who has promised to score a number of identical new pistons in a new cylinder to show the differences :) Jul 1, 2023 · Nikasil plated cylinder and piston assembly 49mm For Stihl 029 MS290 & 039 MS390 chainsaw Replaces OEM part1127 020 1216 www. Jul 12, 2004 · I'v run as tight as . Dec 24, 2022 · Typically, scoring happens when one or more piston rings fail, and a small amount of movement is permitted between the piston and valve wall. Measured the ring end gap with drill bits as feeler guage as none of my normal ones were thick enough. This is classic overheating. Initially dealer said it must be bad gas, which it isn't. Is there two different piston sizes. Aug 6, 2010 · The metal-to-metal contact smears the metal on the skirt on the piston and damages the piston. The rings look slightly marked but compression is still around 140 so I'm not greatly concerned. Oct 11, 2016 · Usually a straight gassed piston will have scoring all over it, not just the exhaust side like a leaned out one. 202. Jan 5, 2022 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Feb 16, 2019 · A neighbor asked me to look at his chainsaw which wouldn't run. Available he Feb 29, 2008 · I will post pictures of the piston in a day or two when I get the saw back. Rope works well, but care must be taken to keep it out of ports/ exhaust. Then proceed with disassembling the engine and removing the old rings to replace them with the new ones that fit properly. The 051 clutch can be a bear to get off, especially if your using rope as a piston stop. Apr 4, 2013 · The "scoring" is where the piston/cylinder get hot enough that the aluminum piston melts and transfers onto the (cooler & harder) cylinder liner. Jan 5, 2017 · Reviving and old thread and hijacking it. But what causes this disaster to happen? Let’s find out. Nov 1, 2010 · Rings looks good, piston ring grooves looked good also. Got the saw running with no problems. It has been having some trouble with glulams with epoxy, ripping down the middle about 8" for steel knife plate notching. Should get a 600P on Wednesday with a toasted top end and I will get to have all this fun again. Chainsaw engines need to be worked long, hot and hard, once broken in, to keep them in good shape. From the one picture, it looks like significant scoring. com Jan 11, 2009 · Yes the pistons wear. It probably has three hours on it. Lube the cylinder wall. 261K views 6 years ago. Piston damage is a common issue faced by chainsaw owners. I've been making some cuts and rips in commercial framing. Do you have a blown, scored, seized or damaged piston or cylinder bore? Chainsaw or petrol / gasoline powered garden tool not starting or working? In this vi Chainsaw piston scoring - how bad is this? Option A was sell it for parts and spend $450 on a new one again or buy the top end kit with new cylinder and piston Aug 13, 2015 · The piston in this situation was causing dead space turbulence without windows. This damage looks similar to piston damage caused by running straight gas shown in the first image, but with this piston, conditions under the piston looked normal. May 19, 2013 · When a saw is running, there's a lot more flying around in the air than just sawdust, dirt and grit, dust, etc. Anything to worry about here or just run it? It runs fine I just looked at the piston since I purchased this secondhand. Urbicide summed it up pretty good far as why they score. The fuel coming into the intake side cools that side of the piston and rarely does it score unless the fuel has no oil in it. The piston looks good too except for where it passes the exhaust port. 648K subscribers. Nov 8, 2017 · Usually loss of air filtration leads to scoring on the intake side. most all the 125cc kawasaki yamaha suzuki honda are 1 ring, the jump to 250cc brings the additional ring, maybe its needed there. Reading other sites, it seems that using 4043-6% silicon content, or 4047-12% silicon aluminum tig rods can be used for welding on racing pistons, so why not a chainsaw piston. They look good and the 820 has awesome compression. Aug 8, 2024 · Chainsaws are crucial in landscaping, tree clearance, and other labor-intensive tasks. Removing the Engine Step 1: Remove the Spark Plug Wire I don't think the piston looks horrible. Sep 12, 2021 · If you suspect that your chainsaw has a scored or damaged cylinder, it is recommended to disassemble the engine and inspect the cylinder and piston for any signs of scoring or damage. I just went through my 028AV Super, replaced piston/ring for scoring, carb kit, all the rubber hoses, filters, muffler mod, and down sized to a 16" from 24". Steve's Small Engine Saloon. Wouldn't hurt to use less oil in the mix. of this engine didn't notch the end gap to clear the locator pin but simply made the gap much, much wider. Piston and cylinder have scoring at intake and exhaust only. Nov 1, 2012 · So I decided to pull the 70psi cylinder head off and take a look inside since from the exhaust port the piston looked good and so did the inside of the cylinder. Oct 23, 2007 · The scoring on the cylinder wall is not that bad I would say but a finger nail could catch. 005 to . Check this before you waste any more Apr 27, 2011 · When I got my Jonsered 830 the rings were stuck to the piston because of aluminum smeering. 004″ gap per inch of bore. I'm pissed as ****, but Sep 14, 2011 · I would think that the average chainsaw piston and cylinder if proper mix is/was used, has a greater chance of dying due to being smashed by a tree or someone driving over it or falling out of the back of the pickup truck, then actually wearing out any faster or slower because of some breakin procedure. 037 just below the crown. The crankshaft bearing cages are shot so I’m replacing them (if I can get them off!), but I’m having a hard time diagnosing the scoring on these parts given my lack of experience. No scoring. I figured it would go for a lot more than it did. – Cylinder Walls Scoring: Cylinder walls scoring occurs when the tolerances between the piston and cylinder are high. Thread starter M&Rtree; Nov 29, 2021 · An over-revving chainsaw is highly hazardous to your engine, as it can not only score the piston but also overheat its components, resulting in a total seizure. A seized piston causes scoring. Never heard of anyone trying it with a saw/2-stroke piston? Oct 14, 2014 · I just purchased a used Husqvarna385xp and pulled off the muffler to discover some mild scoring on the piston. 0015" (2. At TDC the piston kind of wriggles under load and too much of this wriggle(my term) and the top gets damaged on the edge. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Mar 2, 2016 · This way, you wouldnt have to do a lot of milling to the cyl or any grinding to all the port areas since timing should remain unchanged. The piston skirt is the intake valve on a two stroke saw with no reeds. the added ring almost seems like it would be exstra drag, heat, and wieght in the cylinder When the piston got stuck due to lack of lubrication, it seized the chainsaw engine up. Is it possible to repair by honing the cylinder and moving the radial position of the piston ring? Dec 24, 2010 · New cylinder and piston. Is this piston salvageable? Ill try to get a pic up as well to show what I mean. Sep 5, 2020 · I pulled the muffler on my MS361 this morning and noticed the exhaust side of the piston is brown except for the rings. #chainsaw #chainsawpiston 1-3/4" 1. When I got the head off and looked I saw some very light scuffing/scoring right below the intake port on the cylinder wall. Why is my piston scored on my chainsaw? Applies to 2 stroke, 2 cycle lawn and garden equipment, in Nov 15, 2005 · When I first pulled that cylinder and saw the scoring, I should have just bought an entire engine from Fish. A really worn piston will usually show more performance loss than one with a small amount of scoring on the skirt. My plan is to split the crankcase open, to remove all debris, change bearing and oil seal and put a new piston kit in it. When you get into more complex things like multiple cylinders or hydraulic equipment, it’s cheaper for everyone to fix what’s there. Also check the gas in the tank by pouring in a clear glass jar, then you can see if it is gin clear or if it has color that oil is mixed in it. Apparently it will be about 75% of the cost of a new 290 to fix this one. I have an older 036, the piston is dark, the saw has gobs of hours on it, but I don't see any vertical scratches on the piston. 0035"). Dec 18, 2018 · Scored Piston – No Compression. :msp_confused: End gap was 5/64". Dec 4, 2018 · MS-310 piston scoring. I have an old Stihl 090 chainsaw and the saw seizes up after running 5 mins. He had a new MS290 egnine up on the auction block at eBay. The coating on modern saw cylinders is much harder than the pistons and will usually last for several new pistons. Jul 12, 2010 · Far as the clutch being tight a long breaker bar and constant applied pressure is the way to deal with them. Put your tighter ring on top for best sealing unless it was really tight, then I would put it on the lower groove to wear in for a bit without getting expanded by as much heat from blow-by gases. Apr 19, 2015 · The new piston w/ washers is in and the cleaned up jug is on. I’m confused on how this new thick piston ring goes onto the piston. As you say, "find out why it failed before you just start putting in new Jun 9, 2013 · Recently I came across a MS280 chainsaw with a 20” bar that wouldn't start even after confirming spark from the ignition coil, swapping in a new spark plug, and checking for good fuel I pulled the muffler and carburetor off and was able to see the piston and cylinder walls and found scoring on the exhaust side on the cylinder wall. Nov 30, 2023 · What Causes Chainsaw Piston Scoring? Piston scoring happens when the piston of a chainsaw repeatedly rubs against the cylinder wall, causing scratches and grooves on the piston’s surface. 0460 and 2. Saw died. Welcome to Chainsaw Parts Online LTD! Select Currency: GBP Pound Sterling; GBP 71–75 Shelton Street Covent Garden London WC2H 9JQ VAT number: GB 446589938 Company registration number: 13554698 Aug 6, 2020 · Stihl 261s Scoring Pistons. If the carburetor is okay, let’s check the piston for scoring. could carbon have been pulled in and scored the piston? the brown Dec 11, 2007 · Piston measurements: ~1/4" up skirt 2. AAAARRRRGGGHHH!!!!. - good saws, worth the rebuild May 31, 2016 · It looks like it was ran hard on bad gas. But it's a compromise. There is scoring on the piston and light scoring on the exhaust side of the cylinder. Nov 9, 2023 · HUSQVARNA 36 Chainsaw CRANK & PISTON, PISTON HAS SOME SCORING USED/OEM. Waiting on the new collar that drives the oiler worm and the saw will be ready to finish assembly and fire it up. The cylinder appears to only have aluminum transfer and no scoring, but you'll know for sure after you hit it with some 120 grit by hand. May 24, 2021 · Problem: saw all the sudden died when trying to warm up and died again when I actually put it in a log. Subscribed. Nov 4, 2008 · I took a look at it and it seems to be showing the classic signs of running lean - substantial scoring on the exhaust side of the piston, but the intake side looks just fine, from what I can see of it. Like all machinery, chainsaws can suffer damage and need repairs. I don't want another failure. 68 AV Buffer Plug (3) . Makes good compression, no scoring or broken cooling fins Fits Remington PL5 PL5a PL 5 5a and many others. 14 Replies 36540 Views Last post: May 11, 2014, 10:28:50 PM by Al_Smith : Scoring Mar 9, 2008 · Piston Part number from the old husqvarna 61 rancher IPL is different than the new piston part number which comes up as fitting 1988 and up husqvarna 61 saws. Oct 20, 2008 · doesnt matter. Install the new piston (with the arrow on top of the piston pointing to the muffler) and piston bearing. Our modern saws could be adjusted to run @ 17,000 rpms or higher, but aren't because the piston will melt, so the mixture is richened up to slow it down to @ 13,000 or so. If a shop is doing the work, run it until it looses so much compression to require piston and a cylinder. I found this saw at yard sale and bought it hoping to rebuild or use for parts. Started by JaredR, August 06, 2020, 09:15:08 PM I have heard of chainsaw carving guys having issues due to running the saws at part Jan 9, 2018 · I had the new piston installed to the rod with new bearings. 4/1 "of bore size,with 5 or more thou over that reading being replace time excess clearance on piston skirt is I have experienced that piston rings are at fault and a replacement fixes the issue in most cases. If you want to save money, read a lot here and tear the saw down. Was 150psi. But it usually causes problems all the way around, not just at the intake and exhaust. have looked into new jugs but found to be very expensive. A good way to check that is to remove the muffler and look in through the exhaust port into the cylinder. 75" diameter piston kit includes: piston, rings, wrist pin. 36 Bass Bearing (2) $3. The new piston showed some slight scoring. In some cases, the same can happen if the chainsaw’s carburetor is too lean or if it was not functioning properly. Condition: Husqvarna Piston Chainsaw Parts, Husqvarna Chainsaw Piston & Cylinder Kits, May 23, 2011 · This causes the piston to become "larger" in diameter. I consider 130 psi the cutoff. I have a Stihl 045 and 036 that both experienced piston and cylinder scoring on the exhaust port side. The piston-to-cylinder clearances in most late model engines is much less than it used to be to reduce piston rock and noise. 040 at the skirt, and 2. If the piston has scoring like that, the cylinder usually has significant damage as well. 006 on 52mm bore racer with single ring. Jan 25, 2023 · View attachment 1113589 Don't really know what to look for in rings! They don't appear damaged but then they are 40 years old now! It's from 1983 and everything on the saw is original as far as I can tell, bar nuts, cover screws, even the air filter, the plastic on the handle is well intact and the carb adjustment screws look good so it's either been well looked after or not used that much. Check Your Chainsaw Piston and Cylinder For Scoring - YouTube. Nov 9, 2019 · Disaster has struck my big Husky chainsaw which I acquired 10 years ago. There is no discoloration on the piston but the exhaust port is full of carbon. The cylinder is completely cleaned up and does not have any scoring. i come from the motorcycle world. Apr 20, 2002 · If the two test prove OK, then I would check the squidge band, this is done by using some Plastigauge, which many of the tuning guys use, it is placed on top of the piston, and when the piston reaches the top of the bore it squashes the gauge, which can then be measured using the supplied paper gauge. I do not want to put a new piston in Feb 24, 2016 · The ms 260 i picked up few weeks back had a bad fuel line which must have been the cause of the lean condition. 3K. They still seem to be running well and have good compression (by feel not with a gauge), and I can't see any scoring in the cylinder or on the piston. it was a great deal except for the fact that the piston is scored. Seems I should replace the piston again, but need to know what is causing this issue. My 55 has some visible and by feel significant scoring on the exhaust side. 046 The "used" oem piston measures 2. 195. He ran a couple of tanks of gas, and scored the piston. Any Oct 29, 2008 · I gave my daughter's boy friend a used MS290 that was in good shape. It runs fine for 4 mins and slows down, then seizes up. Both look nice and clean, no scoring, marks or such. Heat Generation. Mar 27, 2024 · Lot of new pistons have the horizontal grooves, not vertical. The engine collected carbon deposits and the ring stuck. BIL told me that he had recently had a cracked fuel line replaced, so I'm theorizing that the damage occurred due to the bad fuel line. Lube the rings and piston. com Top end motor kit includes: cylinder, piston, rings, wrist pin. I almost puked when I saw it went for $99 bucks. They wear in auto engines also, it is just more critical in two strokes as the piston is the valve. Thread starter M&Rtree; Start date Mar 24, 2014; Help Support Arborist Forum: Piston scoring. Symptom - Shattered piston skirt. What I'm curious is if there is an easy treatment May 22, 2017 · Hard to say, but the horizontal marks on the piston are factory and indicate low run time. My question lie's in this, the best measurement I can get on the bore is just above the base, and it measures 2. Jul 4, 2011 · The reason I ask I rebuilt a chainsaw with an aftermarket P/C and it did not turn out well. I bought this saw used and it has ran fairly well, no issues. Install your new piston and rings in your 'freshened' cylinder with ample 2-stroke oil, pour some fresh mix in the tank and go cut some wood. 4. A-12257-A, A12257-A, A-12257a, a12257a New Aftermarket part Fits Homelite 360 35SL 35 350 SL 360SL We strongly recommend also replacing the bearings that press into this piston for the wrist pin and small end. Most users port their chainsaws to increase the engine’s power output. May 6, 2007 · So rather than go with just piston and rings, I bought: Piston Pin Bearing $1. As for that 024, if its scored up on both sides, intake and exhaust, that usually a sign of pure gas being run through the engine. Looking at the exhaust port the edges of the port are covered with burrs. Insert rope when piston is near top to avoid this happening. Mark Nov 17, 2011 · Pulling the muffler off revealed some piston scoring; I’ve also discovered parts are hard to find. May 19, 2018 · How to analyze the failed piston to determine the cause. Cause - Piston to cylinder clearance too large or engine over-revved. What do you guys think? Jul 29, 2004 · After much fussing, I found my Poulan 2775 Chainsaw will not start because there is inadequate compression. I get 150lbs compression with the piston with slight scoring on the exhaust side. This kind of damage can be caused by over-revving the saw, running the carburetor adjustment too lean, by ignoring an air leak in the saw's engine, or a combination of factors. Chainsaw piston-cylinder scoring What causes scoring on cylinder walls more. However, porting also increases the chainsaw’s torque, speed, and fuel efficiency. After a pull on the starter handle the saw seemed to lack compression so I removed the muffler to find severe scoring on the piston. I took it apart and this is the view. Aug 17, 2021 · MrJustDIY On How To Check Your Chainsaw Piston And Cylinder For Scoring. But my question is can you save a scored piston. Nov 3, 2009 · Another interesting point was the Tecomec and OEM 038M cyls differered in bore by 0. 1996",~1" up skirt 2. Then put in an aftermarket piston -- Northwood Saw has decent pistons for a better price than the ebay vendors. Aug 28, 2015 · The 066 piston I had from Baileys was too tight in the bore and would scuff almost immediately. Your piston and cylinder may have been scored if this is not the Jan 28, 2014 · Exhaust side piston top as shown in the picture and a polished inlet side skirt indicates (IMHO) that the saw was under a bit of overload. Scuffing or scoring will be visible on the intake side of the piston in the area of the beams, IN ADDITION to damage on the exhaust side. The saw cuts like an animal without shaving the base, pop up piston, or changing the port timing. Most 590s are known to be tuned too lean from the factory and won’t allow the jets to open far enough. 0450") by 0. 019 squish. Crankshaft and crankcase and rod included for your convenience but may or may not be reusable. 9 KB · Views: 47 Piston Failure Analysis Guide - 2006. Feb 29, 2008 · A scored piston and cylinder is almost always a symptom of the actual problem. Install the rings onto the piston, making sure the grooves slide into the pins. One nagging problem is the saw bogging down under a Dec 14, 2007 · Well today i was given a free husqvarna 51. Excessive heat causes the metal to melt. There are Jan 27, 2013 · Cylinder can likely be saved, piston would run maybe $40 for a Meteor, which is a good aftermarket piston, seals are probably less than $20, that’s as much as I’d want to invest and we haven’t even looked into carb kit, fuel lines and other bit and pieces. Ring groove is positioned slightly higher on the new piston than the old piston. It looks like there are vertical marks the remind me of either bits of a bearing cage (not likely) or bits of carbon (likely) getting bounced around and eaten by the piston. I haven't taken it apart to check the ring but the piston seems pretty tight and the compression is ok. I have located a Pioneer Farmsaw P41 cylinder and piston but noticed that mine has 2 rings and the Farmsaw only has one (plus the Farmsaw has a compression release). What causes this and is this a cause for concern? From what I could tell the cylinder looked great. If you were going to do the labor, take it apart and see if you can save the cylinder. Once the saw dies or is shut off, the piston cools and returns to its correct diameter. 1985, Lowest point 2. It seems there was a lot going when this saw grenaded. Sep 23, 2023 · I pulled the muffler off a 372 XPOE and found some carbon near the top of the piston and if you blow it up, you can see mild vertical scoring on the piston. i dont have a compression tester but i assume by the silver streaks on the piston and the fact that the original owner didnt want Mar 25, 2014 · Chainsaw . Another option is a squish wrench (not sure if this is the proper name). Nov 20, 2014 · Here is a lean seized 261 piston. Porting can extend the lifespan of your chainsaw while increasing its power. The exhaust side is pretty well dusted but you can see it's worse on the pto side if the piston Here's the intake sidethere is scoring on the direct opposite side off the heaviest scoring on the exhaust side. Standard suggestion is to scrape exhaust port with wooden tongue depressor, with piston near TDC. It's from a fs100rx string trimmer. Nov 20, 2012 · 2013 Stihl MS 362 with 18 inch bar; Cutting a holly stump about 16 inches, did not pinch. 5 KB · Views: 34 Reply. i assume the cylinder is junk too but how can i tell. Is this too sloppy? Jul 28, 2017 · Nice looking saw, looks like you need to pull that jug and hopefully it will clean up, order a new piston, meteor are good, and before you even pull it down if you can give it a vac-press test to see if an air leak caused it or after to double check your work, seals are cheap and should be replaced anyway. Oct 24, 2010 · Need help on cause of cylinder and piston scoring My 036 just took a dive so I took the upper off and found heavy cyl scoring top to bottom on recoil side of intake and exhaust ports and lighter on top half on clutch side of exhaust port. Chainsaw pistons are caused by what? In general, scoring of the cylinder wall and piston skirt begins as scuffing and progresses to scoring over time. Jan 16, 2016 · I have a MS290 that has a scored piston. Everything is ready to be put together now. Obviously, Wiseco makes very nice pistons. I left a note saying that if there was any scoring, for him to contact me before processing the order. Of course, they could just be an illusion created by the picture. Yikes! The mfgr. In some cases, the piston skirt gets worn out due to the continuous rocking of the piston against the cylinder walls. Proper maintenance, such as cleaning the engine and using the correct fuel blend, can help mitigate future damage and prolong the life of the chainsaw. Is your chainsaw running poorly or won't start at all?In this video I show you how to check for a scored piston and rings on your 2 cycle equipment like chai Stihl 038 Magnum Chainsaw Piston Assembly 1119 030 2002 (new piston box) Part: 52mm bore piston with rings, pin and keepers 1119 030 2002 Condition: new, after-market part Fits: Stihl 038 Magnum, MS380, MS381 Jan 22, 2010 · It may just need rings if that in fact is the problem, the best way to tell is compression test it yourself and if it is low pull it apart, measure your cylinder bore and piston and if they are within specs pull a ring off and check ring end gap and it will probably be out of specs if it is wore out and just get new rings, more that likely that is all it needs if everything is as they say. Nov 30, 2023 · How to Replace Piston Rings on Chainsaw? To replace piston rings on a chainsaw, you’ll first need to collect the necessary materials, tools, and new piston rings. The Tecomec piston would have been a tight fit in the Stihl cylinder (0. Dec 28, 2015 · This is black and white but is a high res scan from the nicest of the three different versions in my hardcopy literature collection. I am new to your site, but have seen a lot of expertise available to members seeking help and opinions in situations like my current dilemma. The right piston stop and a long breaker bar is the best way to deal with those big clutches. The scoring in light. This is just my opinion: If a newer design has less parts, its usually because the manuf's bean-counters want to bring down production costs and rake in more profit. I was Jun 18, 2024 · Consider porting your chainsaw if it is not cutting wood efficiently despite your best efforts. A seized chainsaw should be quite the problem for chainsaw users, especially when they are in the middle of an actual job. I purchased one of their piston and cylinder kits for a 064. Until now the only pistons I found were Golf . Oct 27, 2010 · The issue with this chainsaw is that it has been run on stale gas, incorrect oil/gas mix or incorrect 2 stroke oil. Very rough when you run your MCB Performance 14500 Foley Rd Capac, MI 48014 P: 810-395-7162 F: 810-395-4721 Email: mcb@mcbperformance. Is this water enough to cause the problem. 6 Replies 358 Views Last post: March 27, 2020, 09:25:45 PM by mrcaptainbob : Replace piston rings, piston, or cylinder? Started by Spruce_Goose on Chainsaws. I will replace the piston when it shows a lot of shiney wear on the intake side. Kim quick, opened it up, great quality, really good machining, I did a little bit of deburring with a Dremel and did a gasket delete and ended up with . husqvarna 350 and jonsered 2150 chainsaw piston and cylinder set NEW OEM Mahle 503 86 99-71 (upstairs) Part: 44mm Bore piston and cylinder with ring and wrist pin Part # 503869971 Condition: new, old stock from closed out dealer. Exhaust side gets the hottest and shows scoring sooner, but my guess is that a really lean running saw could show scoring all around the piston. Jun 14, 2005 · Hi everyone, Quick background on the saw. Which way do the markings on the piston face, should the ring gap be in a certain position and what do Nov 20, 2008 · We have started a new forum dedicated to user/instruction manuals. Mar 9, 2024 · Chainsaws were around for 50 years before the EPA got involved and the manufacturer didn’t limit jet travel. I just put one in an 820 and have one to put in a 920. Nov 18, 2017 · From an engineering perspective, the more points of contact, the more stable an object is. I don’t know if it is worth it to put the saw back together with the proper parts. That is why we look for the machine marks on the piston as an indicator of wear. The piston appears to be symmetrical so this begs the question as to whether or not piston orientation even matters in this case. 1985 Don't know if this is "OK" or not? If I have to get a new piston I noticed that some pistons seem to have a completely open side, while the one I have has two holes on each side (for transfer port flow). Feb 9, 2010 · I am sitting here looking at my my P&C and taking measurements. The piston is done for; I've used multiple Meteor 028S pistons (3 I believe) with no issues. Dec 7, 2023 · I just scored an oem jug and piston kit off chainsawr in “good used condition. I have re-ringed the saw once, but I can't see the machine marks on the piston at all May 16, 2023 · What is porting a chainsaw? It involves improving the performance of your chainsaw by altering the intake and exhaust ports or making other modifications to the internal combustion engine. 0485 and 2. It is a 44mm bore just as my saw, however the piston skirt on the one I received is longer and catches the case at the bottom of the stroke so much as to not allow a rotation. I used 93 octane (4gal) and (2) stihl 2 cycle mixes (orange ones). Now I'm wondering if I should stop using the metal piston stop. FS trimmer is fine 55 series blowers are fine and the ms210 as well. Espian make a piston for the 920 and 820 saws. Any ideas what is causing this? I have had some seal failures in the past on the flywheel side on 026's. All piston scoring failure modes I’ve read about are on the other input and exhaust quadrants of the piston. The most common cause of cylinder scoring is running straight gas, or improperly mixed gas. I pulled the jug, removed the rings without breaking them, cleaned the grouves, and put the rings back in. At the limits of its motion, ie both sides of tdc and bdc, it is subject to horizontal thrust, ie Piston slap. Up to the other day I had no problems (that I know) using a metal piston stop. Oct 29, 2021 · How to fix a scored chainsaw piston and cylinder Nov 20, 2010 · I'd go direct, OEM, part#-off-the-IPL drop-in replacement. The same guy I got this 261 from brought me a 260 with the exact same problem the next week. qzima rmiirpz wdp jcekb izzh hwzun vikeme pbju hwb odtkjl