Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. }, Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. No it wouldn't go straight to crankcase because you would spray a light mist through air intake with hot engine and let it run for a while after doing it.You might want to do it with screen removed from muffler. Make sure you have a gauge with a schrader valve right at the tip of the spark plug adapter or you will get a low reading every time. } 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 would give you rusted bearings. I hook up a drill to the nut on the clutch and start hard starting saws that way . I bought 2 032 Stihl saws at auction that pulled very hard. Guido Hello EGBinOR, If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. Stihl 291 chainsaw too much compression Check the compression of the engine. Then Google decarb . Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. what and or where is the metering lever.? Make sure it fits snug. Follow the steps below on how to fix a flooded chainsaw engine. I would suspect the timing is too early. 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. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. I have had the cylinder off. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Another big issue that causes too much high compression is the lack of oil in the starter system. It is basically the same product as TruFuel (same base synthetic fuel with different synthetic oil) that is sold through Stihl dealers and endorsed for use in all Stihl 2-stroke engines. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. "@type": "WebPage", If you are trying to start your chainsaw in winter and the oil you used for the chainsaw assembly is not suitable for the winter season, you also feel high compression. after that I'd be looking at crank bearings. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. 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. Wipe off any dirt and debris and check for any signs of damages. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Low pressure, 20 to 30 pounds is all you need. Pull the starter rope until you hear the first sign of it firing with a small burp. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Would not be afraid to do it to a 4, 6, or V-8. No it wouldn't go straight to crankcase because you would spray a light mist through air intake with hot engine and let it run for a while after doing it.You might want to do it with screen removed from muffler. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. If it does maybe it is plugged. The Stihl chainsaw comes with a sturdy body, strong teeth, and a smooth rotating bar to help you cut through trees, ice, and even concrete with ease and precision. In other words, the problem is in the trigger itself, not a. carb adjustment screw. Convenient, durable and robust with minimum weight, the STIHL MS 260 can come with a number of optional features to make the job even easier. It is possible however to flood a two stroke which can cause the plug to fowl. First thing I'd check is the pull start assy. Blup throttle to bring it down to idle. Repair or replace the damaged part 2. Each chainsaw has a different level of compression. $49.99. If any of these components are worn or broken, the chain saw wont start even with fuel. Compression is measured by using a simple screw-in gauge. Then Google decarb . It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. I think that's what happened, although I didn't think such a small amount could do it. Turn the brake off. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. All it needs is a few inches missing and it will pull too hard like the compression is too high. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. water will not dissolve carbon; it is far too hard to be effected. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. When it comes to power tools, good maintenance, and proper use will maintain the functionality and lifespan of the tool regardless of whether it is an electric miter saw or a gas power chainsaw. 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! I;ve read somewhere to put water? When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. What ratio mix is he using? The excess gas can be cleared simply by removing the plug and operating the starter a few times. 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. Turn off the choke by pressing the control lever to activate the fast idle. They're easy to use and inexpensive, so if you are considering buying one for your home, there are a few quick things you Consumers in the Home and Garden sector turn to us for answers to their nagging questions about various goods and services. Hello. To ensure that enough air reaches the chain saw's engine, remove the air filter and clean or replace it, depending on the manufacturer's instructions. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. The saw runs and starts great. A chainsaw Battery blinking red is one of the most frustrating things a woodcutter can, Read More How To Fix Chainsaw Battery Charger Blinking Red?Continue, The standard compression reading required for most 2-cycle chainsaw is around 100-110 psi to start. It's also possible the piston or cylinder are scored or carboned up. It can be from something as simple as starting the chainsaw wrongly to more severe issues like a damaged carburetor. 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! Choke cannot be used even when engine cold, or flooding occurs. It's also possible the piston or cylinder are scored or carboned up. I would never put water in it! Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. Our aftermarket suitable replacement Stihl MS 250 C chainsaw compression release parts meet or beat OEM specs, offer a considerable cost savings, and usually ship in 24 - 48 hours. While rope attached to a pulley, the further connection of the pulley is with springs and pawl to make sure the pulley is tensioned and helps in retracting and spinning. Activate the chain brake and then place the chainsaw on a flat, leveled surface. Are you sure the starter rope isn't a little too short? I would suspect the timing is too early. Unscrew the spark plug wrench using a spark plug from the engine. Remove the sprocket and the washer. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. It would give you rusted bearings. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. ", What is the minimum compression for my STIHL chainsaw? You should also make sure the new gas you use is appropriate for the chainsaw. Reddit and its partners use cookies and similar technologies to provide you with a better experience. That is the nature of a 250. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Continue with Recommended Cookies. What worked with my MS440 kicking problem should also work with that one. Carboned rings will decrease not increase compression. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Youre familiar with how to start a stihl yes? Thanks! As the starter, spring plays a vital role in running starter assembly smoothly. Open the spark plug hole facing away from you, remove the wire from the spark plug and disconnect the spark plug using a spark plug wrench. Does the saw have a compression release? 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?? Replace the spark plug with a new identical. A drastic and frankly silly thing to do though . If you still want to try and get carbon out of the saw either take it apart and clean it or use something along the lines of sea foam. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. ", If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. $75.00. Fine adjust everything and both saws start Normal now. The manual for this model, and the parts breakdown, show a compression release valve. I went with a meteor piston/cylinder set. 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. 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. Locate the spark plug from the top of the engine underneath the chain brake handle. Doesnt pull at all or just hard to pull. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. Register today and take advantage of membership benefits. The saw feels good in my hands and its got a surprising amount of power. lol. I was given (estate) a small McCulloch chain saw and it started and ran great. However, these moving parts, to stay moving, require a substantial amount of compression. I would never put water in it! Stihl 024 - Sherlock Holmes issue - help needed here. "dateModified": "2017-08-17", Are you sure the starter rope isn't a little too short? Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Does the saw have a compression release? If the chainsaw still wont start, it is defective and requires a replacement. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. All it needs is a few inches missing and it will pull too hard like the compression is too high. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. 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. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. It may not display this or other websites correctly. idle. Would not be afraid to do it to a 4, 6, or V-8. Insufficient fuel in the system may result in excessive compression. The exhaust is black but no build up. Make sure it is snug but can also move freely by hand. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Its just that its nearly impossible to pull. If the chainsaw is too much compression, it may be difficult to start. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. What are the numbers on your sparkplug? water will not dissolve carbon; it is far too hard to be effected. Check for dirty fuel tanks, clogged fuel filters, loose pipes, clogged air filters, and a dirty carburetor, which can all the fuel volume going into the combustion chamber. }. Why is the Garage Door Opener Light Not Working? Also take the spark plug out and do the same. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. You will notice the compression less. We describe all the possible issues and also suggest the solutions to fix them too. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. This could be understood by reading the further explanation below. MS250 start compression relief stopped working. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. You may also want to go ahead and replace the plug. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. 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 50CC engine needs 150 PSI compression. Take off the muffler or the carb to get access. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. If oil is in there it is what makes the engine feel like it is almost locked up. Check the tension 2. A heavy-duty engine gets hot faster and works better than a cold engine. Register today and take advantage of membership benefits. So be sure to keep your chainsaw properly maintained and avoid compression problems. 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. Try it, it may just do the trick! Your email address will not be published. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. If not I'm honestly kinda stumped. Welcome! Therefore, it does not need any compression rate to start. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. I hope you understand the problems why your chainsaw is hard to pull. Generally covering everything under 25 HP. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Whether you are a beginner or a professional woodworker, knowing how to fix your chainsaw will save you time and money seeking help from a service center. It runs good after I get it started. My /Sthil 034 is very difficult to start. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. If it is over loading on fuel the carb may need rebuilt to stop the diaphragm from leaking fuel into the cylinder after the saw is shut off. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. It uncoils, tightens the spring, engages the clutch to start the engine. of compression. I would suggest clearing the cylinder by pulling the rope with the plug out. A lot of variables might contribute to excessive compression while using a chainsaw. The Stihl chainsaw is a two-stroke gas-powered tool that uses a substantial amount of compression to pull fuel from the tank, mix it with air and ignite it to produce energy that runs the chainsaw. As long as I can get it going.. It is best to put a new plug in after clearing. Too much carbon will do that, check the piston top and combustion chamber. Create an account to follow your favorite communities and start taking part in conversations. If oil is in there it is what makes the engine feel like it is almost locked up. in the. Every chainsaw needs to have some compression to ensure that it operates well. I bought it used around 1978. When this pressure, or compression, is too low or high, the chainsaw . 24" is what I've got on mine, but it can handle a bigger bar. Take off the muffler or the carb to get access. It very often kicks back and pulls the starter rope back in. You can use a ratchet to do the task. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. You need to pull the exhaust to check that. There is no carbon build up and all looks like new. 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. Don't know what to do at this point. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . The chainsaw has grooves all around the outer edge of the guide bar, and the chain has teeth that run within the bar rail to keep the chain in place and moving straight. Runs well, except it. "@type": "ImageObject", 1. saw has new carb 2. flywheel has been removed and key inspected. Remove the entire carburetor and clean it. You are using an out of date browser. 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. Also check the air filters and make sure they are clean. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Are you sure the starter rope isn't a little too short? Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. The plug should be tight against your thumb. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. A drastic and frankly silly thing to do though . Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. Once it's removed, you can place a gauge on the place of the spark plug. "author": { I used to have a Homelite that would do that if I left gas in it. The early 064, 044, 066 came with a red master control. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. If it is over loading on fuel the carb may need rebuilt to stop the diaphragm from leaking fuel into the cylinder after the saw is shut off. On a 2 stroke the water would go into the crank case first and pool up. Final step: removing the old spark plug and installing the new one. People sometimes try to cut down a tree that is too big for their chainsaw. Hello EGBinOR, 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, Guido. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. "text": "My chainsaw has gotten very hard to pull the rope. Has someone invented a new kind of two stroke motor? The exhaust side of the piston is a warm gold. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Additionally, most spark plugs come pre-gapped. It may not display this or other websites correctly. Pull trigger and set full choke. Use of this Web site constitutes acceptance of our. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Trying to rotate the chain while a huge piece of wood is . Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. On a 2 stroke the water would go into the crank case first and pool up. Also check the air filters and make sure they are clean. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. 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. Ron Cook. I luv my 064. Try blowing the crankcase out with air. A hot engine also requires more compression to convert furl into energy as compared to the colder one. The following have been addressed. The flywheel is loose? Stihl oil has been used. Once you identify the cause of high compression, you can repair that affected part or find a new replacement for it to make it work smoothly. Every chainsaw requires a different compression level according to its built-up and model number. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. Normally it's not a problem but if it was already difficult to pull it could be. But it was stolen along with other tools around 1990. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. "interactionStatistic": { All it needs is a few inches missing and it will pull too hard like the compression is too high. Manage Settings Maybe the piston is hitting it. Posted December 27, 2017. Any ideas? A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips.