stihl chainsaw too much compression

As the guide bar wears down with use, the bar heel- the part of the bar nearest to the drive sprocket- also wears down, which increases the distance the chain travels as the bar grooves become less effective. It works when cold-starting the engine, when the engine is idle and when the engine is open. Would have to remove spark plug and rinse cylinder with gas to be able to start. Start new topic; Recommended Posts. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. 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. Although this is often true, it is not always the case. No compression when pulling start rope. The switch might be damaged or the motor is burned out. The plug should be tight against your thumb. I love to write about chainsaw for homeowners and professionals. 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! Remove the sprocket and the washer. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. after that I'd be looking at crank bearings. You're familiar with how to start a stihl yes? Check the electrode gap of the spark plug and ensure it is 0.02 inches. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Below are the reasons the chain keeps coming loose and how to fix it. What ratio mix is he using? A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. A two-stroke gas-powered chainsaw uses relatively few moving parts. Maybe the piston is hitting it. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Another common cause of chainsaw compression problems is a faulty quantity of old gasoline. I've done it to high hour Kohler engines many times. If the chainsaw is too much compression, it may be difficult to start. Back to top derwen1959 Long Time User 1. saw has new carb 2. flywheel has been removed and key inspected. Here is how to troubleshoot a malfunctioning spark plug. "image": { Refill the chain oil by opening the cap on the chain oil tank, filling up the tank until the level is below the cap threads, and then replace the lid. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. 24" is what I've got on mine, but it can handle a bigger bar. "@context":"https://schema.org", It is harmful to your machine to use old fuel. Sometimes the spring stops working correctly due to overuse and becomes brittle. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. in the. Make sure it is snug but can also move freely by hand. The compression limit should also be doubled if the engine capacity is 100 CC. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. Press question mark to learn the rest of the keyboard shortcuts. If oil is in there it is what makes the engine feel like it is almost locked up. It uncoils, tightens the spring, engages the clutch to start the engine. I would suspect the timing is too early. 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. water will not dissolve carbon; it is far too hard to be effected. water will not dissolve carbon; it is far too hard to be effected. "height": 57 Also take the spark plug out and do the same. A 250 has a fair amount of compression for a smaller saw but not that bad. Trying to rotate the chain while a huge piece of wood is . I believe it was flooded, but I didn't think that little bit of fuel would make it that hard to pull but I guess so since it can't compress! 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. I hook up a drill to the nut on the clutch and start hard starting saws that way . If it has to do with small engines, it's welcome here. } Stihl 024 - Sherlock Holmes issue - help needed here. People sometimes try to cut down a tree that is too big for their chainsaw. 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. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Press question mark to learn the rest of the keyboard shortcuts. You are using an out of date browser. I would suspect the timing is too early. Unscrew the clutch assembly on top of the oil pump. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. Other than that, you should also use the correct spark plugs for your chainsaw. If the compression is too high or too low, the engine wont start. You are misunderstanding WHY water is put into carboned up engines. Stihl 291 chainsaw too much compression Check the compression of the engine. Indoor fly traps are an effective way to keep insects away from your home. JavaScript is disabled. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. Oct 24, 2011 / Chainsaw excessive compression #1 . 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. water will not dissolve carbon; it is far too hard to be effected. But the saw just has a rubber piece on the top shroud with a slotted nut that just fastens it to a stud on the cylinder head, where the valve should be. 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. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Ok folks, I'm stumped. It's an older saw I bought at a garage sale. Use recommedend chain oil lubricant. It very often kicks back and pulls the starter rope back in. It takes a Bosch WSR6F or NGK BPMR7A. Save my name, email, and website in this browser for the next time I comment. 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. How to Reprogram a Chamberlain Garage Door Opener, How to Program a Universal Garage Door Opener, Toro Lawnmower Troubleshooting & How To Guide, Bostitch Nail Gun Troubleshooting & How to Guide. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. Low pressure, 20 to 30 pounds is all you need. Chainsaw Parts. Not sure it would accomplish anything on a 2-stroke chain saw engine. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. A drastic and frankly silly thing to do though . Stihl 251 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. Manage Settings Clean any mildly dirty parts and replace all the damaged parts. I've done it to high hour Kohler engines many times. Do that to the starter side when you're looking at the starter assy. 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. 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. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. A large engine has a huge capacity in its motor. Being new carb, wasn't looking that direction educate a non mechanic. Cleaned air filters and both were very dirty. If it is too damaged, you should replace it. I would never put water in it! Check the spark plug and replace it if needed. This could be understood by reading the further explanation below. If you experience low compression, pull the muffler and check the piston and cylinder for, Read More How Much Compression Should a Chainsaw HaveContinue, The possible reasons can be the battery not being charged, properly connected, or dead. I can probably find one with at most 65 PSI. 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. Then Google decarb . The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. 1 2 Next J Joe_Power Joined Apr 18, 2013 Messages 651 Location USA - Coast to Coast, Border to Border Jun 2, 2015 #1 I just replaced the cylinder and piston on a stihl 036. 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. If you see any unusual movement of spring, then take it in to replace it. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. You are misunderstanding WHY water is put into carboned up engines. Your ignition rope must be intact properly with the pulley to work correctly. After that, using a ratchet, remove the spark plug from the engine. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. It will be apparent if it is, but usually a scored saw won't run good, if at all. I've got one here with 105-110 compression that I can't get to run and it feels kinda funny when I pull the starter rope, like it has compression with the piston going up and down. You need to pull the exhaust to check that. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. We got rid of both of those useless things . I would never put water in it! I've seen a 20psi drop with the wrong type of gauge to be pretty common. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . { I have plenty of engines with REALLY low compression that I'll be glad to swap him. Check for any cracks and damages and replace if necessary. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. Currently I live in Austin, United States. Quoting Removed, click Modern View to see What?? About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . "@type": "Organization", However, the compression also has a limitation because a very high or very low compression will cause problems and prevent your chainsaw from operating efficiently. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. We describe all the possible issues and also suggest the solutions to fix them too. Fine adjust everything and both saws start Normal now. Remove the right side cover, bar, and chain. 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. Compression gauges are not always accurate and different engines will provide different results. My question is what is causing the trigger to not slow down. How big a fella are ya? Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. All it needs is a few inches missing and it will pull too hard like the compression is too high. water will not dissolve carbon; it is far too hard to be effected. Replaced the chain and did some serious cutting and was so pleased. 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. We have explained the most effective way to unflood a chainsaw engine below. Don't know what to do at this point. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 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. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. 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. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. For a better experience, please enable JavaScript in your browser before proceeding. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Does the saw have a compression release? Wipe off lubricant and grime from the bar with a clean rag. I got it started. Turn the engine to get under the piston and blow the crankcase out. }, Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. And some will have more. Not sure I would do it to a saw, but the engine is running at rather high rpm when the water is sprayed into the carb air inlet. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. Versions MS 260, Bar length 37cm, RSC What worked with my MS440 kicking problem should also work with that one. On a 2 stroke the water would go into the crank case first and pool up. If it does maybe it is plugged. Sometimes it kicks and the rope pulls right out of my hand. I;ve read somewhere to put water? I thought all the fuel was out but there was some in the line yet. Is the spark plug the correct one for the saw? You can prevent the new starter rope from fraying by burning the two ends of the rope. Can also be used with hedge trimmer attachment HS 246. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. Continue with Recommended Cookies. Create an account to follow your favorite communities and start taking part in conversations. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Carbon build-up in cylinder & piston, bad needle bearing, overused starter spring, oil in the starter system, old or bad fuel, etc can cause too much compression in Chainsaws. There is no idle when I release the trigger. You are misunderstanding WHY water is put into carboned up engines. How Much Compression Should a Chainsaw Have. Dont substitute it with. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . How To Fix Chainsaw Battery Charger Blinking Red? Locate the spark plug from the top of the engine underneath the chain brake handle. 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. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . In fact, Stihl thinks so highly of Motomix, that they will double the factory warranty on their Stihl 2-stroke tools if you use it. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. I would suspect the timing is too early. "@type": "InteractionCounter", OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. 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. 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. Turn off the choke by pressing the control lever to activate the fast idle. I bought 2 032 Stihl saws at auction that pulled very hard. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. or Best Offer. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. The saw feels good in my hands and its got a surprising amount of power. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when 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. It would give you rusted bearings. Register today and take advantage of membership benefits. 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. If it is flooded that should clear it up. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. You will notice the compression less. what and or where is the metering lever.? Another big issue that causes too much high compression is the lack of oil in the starter system. I used to have a Homelite that would do that if I left gas in it. I hook up a drill to the nut on the clutch and start hard starting saws that way . Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. Also check the air filters and make sure they are clean. Make sure it's greased and the bushings are good. Not sure I would do it to a saw, but the engine is running at rather high rpm when the water is sprayed into the carb air inlet. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. Pull the rope until it starts. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. Check for clogging around the bar oil. idle. }, To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. 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. 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. 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. Create an account to follow your favorite communities and start taking part in conversations. Thanks! If the air filter is too clogged, you should replace it. 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. The choke position is the fourth setting on the master control lever. If the rails are shallow, you need to replace them. Would have to remove spark plug and rinse cylinder with gas to be able to start. MS250 start compression relief stopped working. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. A flooded engine is when there is too much gas in the combustion chamber, usually due to repeatedly starting the chainsaw using the recoil system without the engine starting. Thank you for the responses. Then Google decarb . "url": "https://www.yesterdaystractors.com/graphics/smllogo.png",

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