The other reason might be the use of the wrong type of oil for the climate. chain saw compression release mod. You will notice the compression less. I will also add that if you have points, then the wrong gap will alter the point of ignition and can have the same results. Make sure it fits snug. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. But it was stolen along with other tools around 1990. or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. That would have to be some puddle of oil for a MS250 to have a "bar oil leaking in and causing high compression problems" What kind of Stihl oil regular or synthitc, had an 025 years ago that was a real knuckel buster never checked compression but was using regular Stihl oil. Don't put water into the 2 stroke. TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. Check the tension 2. Drain and discard the old fuel, mix new fuel and cycle oil in the ratio 50:1 in a container, shake it and then pour the mixture into the chainsaws fuel tank. You never try to get it to run with the choke on. When your Stihl chainsaw doesnt start after changing the spark plug and fuel, some common problems to look for can help diagnose the source of the issue. It will be apparent if it is, but usually a scored saw won't run good, if at all. I would never put water in it! everything is harder in a tree, not a conclusive test. Dust particles in the air mix with the lubricating oil and clog up the air filter, therefore, preventing sufficient air from getting into the engine. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1 does any pletching or hedge laying go on across the pond?? Starter fluids spray can help in those conditions Before pulling shoulder. water will not dissolve carbon; it is far too hard to be effected. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Try blowing the crankcase out with air. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. Animated Two Stoke Engine Air Cycle, My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. When you start the chainsaw, it triggers the worm drive to engage the oiler to send oil through a port that releases onto the bar. Stihl 251 chainsaw. { By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. You will notice the compression less. Use a can of carb cleaner sprayed into the breather/filter assembly. As long as I can get it going.. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. in the. In a similar vein, if the wrong kind of oil is used, the compression may be increased. I got it going. Are you sure the starter rope isn't a little too short? Youll need to clean the cylinder and piston to fix this thoroughly. Help, can't pull start Stihl MS250 chainsaw, too much compression. Reddit and its partners use cookies and similar technologies to provide you with a better experience. in the cylinder overnight because the rings are cerboned up? You should also make sure the new gas you use is appropriate for the chainsaw. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. I'll even do the labor for free. Could your gauge be off a little? Also check the air filters and make sure they are clean. If the chainsaw is too much compression, it may be difficult to start. ", Make sure the keyway is lined up correctly and tighten the nut down good and tight. Take off the muffler or the carb to get access. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. The first step is to remove the cover that covers the spark plug on your chainsaw. Looks like a saw without base gasket, and too little squish my 250 did the same thing,had to start it with no choke.Take the plug out,crank it the motor and see how much gas spews from the cylinder.Mine would blow out way to much.I had to adjust the metering lever in the carb,no problems after that. If it does maybe it is plugged. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Use recommedend chain oil lubricant. He checked.it clearly says that in the OP. Here is a link for two stroke engine air cycle. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. What usually happens is that the guide bar gets stuck in the tree and they keep running the engine while trying to force the bar out of the tree somehow. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. "image": { Check the chain tension and adjust it if it is too loose or tight. A two-stroke gas-powered chainsaw uses relatively few moving parts. That model is extremely easy to flood. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. A chainsaw with no spark will shut down suddenly or not start at all. I was given (estate) a small McCulloch chain saw and it started and ran great. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. Yeah, I must have flooded it as I was working on it. read more Vince O. Make sure the gap is according to the specifications of your chainsaws engine. A hot engine also requires more compression to convert furl into energy as compared to the colder one. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Turn the brake off. I bought 2 032 Stihl saws at auction that pulled very hard. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. no, afraid I don't have equipment to test. STIHL 026 HARD TO PULL - Yesterday's Tractors The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. I've seen it happen a couple times. This compression converts fuel (any source) into the potential energy in the engine to start it. The owner is complaining of hard to pull start. I went with a meteor piston/cylinder set. The switch might be damaged or the motor is burned out. It uncoils, tightens the spring, engages the clutch to start the engine. Carboned rings will decrease not increase compression. Compression gauges are not always accurate and different engines will provide different results. Replaced the chain and did some serious cutting and was so pleased. If the starter spring is keep working correctly, it will retract the ignition rope. I bought an old beater 621 Jonsered once that had very high compression, got it running well and sold it, made some money on it! $799.99 CHOOSE AN OPTION Deliver From Store e.g., 123 Your Street, Virginia Beach, VA 12345 Add to Cart Order Online - Pick Up In Store Currently Shopping At: JC Licht Ace Hardware-Bridgeport (773) 523-8888 Change My dealer Features STIHL M-Tronic To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . Additionally, most spark plugs come pre-gapped. I have plenty of engines with REALLY low compression that I'll be glad to swap him. If you suspect a compression issue, seek professional help as compression repairs can be complicated. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. The engine must be up to operating temperature, spray a light stream of water into the engine carb air inlet and the cold water shocks the hot carbon and the carbon flakes off and blows out the exhaust pipe. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. Therefore, most people will wonder why the chainsaw has too much compression. Get you some Sea Foam at the local auto parts store. I have had the cylinder off. A clogged carburetor wont allow fuel into the engine, preventing it from starting. Also try removing the spark plug and see how pull starter works, just trying to see if it could be binding in the recoil/starter assy or not. That is what was told to me by the area distributor technician, Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1. Have had it into dealer and nothing wrong with it and dealer said that from time to time they see saws come in with nothing wrong with them but have increased compression. A 250 has a fair amount of compression for a smaller saw but not that bad. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. Trying to rotate the chain while a huge piece of wood is . I love to write about chainsaw for homeowners and professionals. Chainsaw Parts. I think that's what I'd do. It had a compression release, and it started and ran well. The choke should be closed during a cold start to limit the air and increase the fuel in the engine to keep it running while it warms up. Here is how to troubleshoot a malfunctioning spark plug. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Fine adjust everything and both saws start Normal now. Apparently gas would seep int crankcase and over several months of setting gas would evaporate leaving oil behind and first time it was pulled would suck oil into the cylinder. I agree the saw runs great, but when your helping old men with ideas of their own its hard to say I wish I had 190 pounds of compression. Stihl ms 291 hard to pull start? Here's How to Fix It Quickly Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. It's an older saw I bought at a garage sale. Stihl chainsaw compression test | Bob Is The Oil Guy pulls with little resistance, similar to my farm boss. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. #3. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. If the chainsaw is too much compression, it may be difficult to start. I'm an arborist by profession & a blogger by passion. I have a MS250 that has come up on compression since new. Now, the gauge might come in a number of size variations, so you need to use an adapter to make a perfect seal between the gauge and the chainsaw. The plug should be tight against your thumb. "headline":"Chainsaw has too much compression", Remove ignition coil and muffler. Make sure the crank taper is clean and the flywheel taper also. Also check the air filters and make sure they are clean. STIHL Chainsaws FAQs | STIHL Product FAQs | STIHL USA If you refuel your chainsaw and it still won,t start, below are some of the possible causes and solutions that will get the chainsaw functioning again. Remove the sprocket and the washer. It's possible the timing is off a little but without knowing the make and model of the saw that's just a long shot. Not sure it would accomplish anything on a 2-stroke chain saw engine. If the issue persists after the addition of new fuel to the tank, there may be a fault with the gas pipelines or the fuel filters. link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. If not I'm honestly kinda stumped. Getting these problems resolved is a rather straightforward process. Insufficient fuel in the system may result in excessive compression. Garden Guides | Compression Tricks for Chainsaws The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. "width": 200, The saw runs and starts great. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Every chainsaw needs to have some compression to ensure that it operates well. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. Turn the engine to get under the piston and blow the crankcase out. after that I'd be looking at crank bearings. When this comes to a stop, it will come to a complete stop at a certain number, which is the compression of your chainsaw blade. Can anyone make a suggestion. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. You are misunderstanding WHY water is put into carboned up engines. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. Any ideas? Blup throttle to bring it down to idle. Register today and take advantage of membership benefits. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. Thanks. lol. It will be apparent if it is, but usually a scored saw won't run good, if at all. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. It prevents the carburetor from allowing too much fuel into the combustion chamber. I would never put water in it! If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. I've got four other Stihl saws here, an 029, 036Pro, 015L, and an MS200T, only the 36Pro pulls this hard and only if I don't use the decomp button. We and our partners use cookies to Store and/or access information on a device. We describe all the possible issues and also suggest the solutions to fix them too. Dont substitute it with. Generally covering everything under 25 HP. }, Locate the tension adjustment screws to the side of the chainsaw guide bar. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. Quoting Removed, click Modern View to see What?? Pull trigger and set full choke. Read More Chainsaw Primer Bulb Temporary FixContinue, Pull out your battery from the chainsaw, and press the battery button sustainably for a minimum of 5 seconds before you release it. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. The following have been addressed. Would not be afraid to do it to a 4, 6, or V-8. Didnt somehow get straight oil in the cylinder did you? Its just that its nearly impossible to pull. Also, remove the muffler and check for carbon buildup. I bought an old beater 621 Jonsered once that had very high compression, got it running well and sold it, made some money on it! Soaking in water will do nothing but rust things up . water will not dissolve carbon; it is far too hard to be effected. Stihl chain saw too much compression I had to take it apart What Causes Too Much Compression on Poulan Chain Saws? Also take the spark plug out and do the same. All it needs is a few inches missing and it will pull too hard like the compression is too high. Check the chainsaws fuel if you have not used the tool for a while. On a 2 stroke the water would go into the crank case first and pool up. Fine adjust everything and both saws start Normal now. Final step: removing the old spark plug and installing the new one. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. You may also notice that the chain saw loses power during operation. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. If your saw doesn't have a compression release since like you say its not a pro, then the two things I would check is either the go through recoil assembley with a fine tooth comb. The compression limit should also be doubled if the engine capacity is 100 CC. Sometimes it kicks and the rope pulls right out of my hand. Low pressure, 20 to 30 pounds is all you need. When the motor warms up after about a minute, turn on the choke position. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Would not be afraid to do it to a 4, 6, or V-8. When starting the motor when its col, you should engage the choke position to increase fuel intake and reduce air to allow the engine to start. There is no idle when I release the trigger. Follow the steps below on how to fix a flooded chainsaw engine. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. Pull the rope until it starts. I just picked up a well used 025 that runs like a champ and has quite a bit of compression, I have not put a gauge on it but it will pull the starting handle out of my hands if I'm not paying attention. "@type":"DiscussionForumPosting", Would not be afraid to do it to a 4, 6, or V-8. Why Is My Chainsaw Hard to Pull? (5 Things to Check) "@type": "InteractionCounter", The manual for this model, and the parts breakdown, show a compression release valve. To avoid flooding the chainsaw when cold starting, turn the control lever to half choke after the fourth pull and then turn the lever again to the open choke position immediately when the engine starts. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I would suspect the timing is too early. 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