stihl chainsaw too much compression
Most Stihl chainsaws have a resistance of 0.2-3.0 ohm on the primary coil and 5-20 kiloohm on the secondary coil but always confirm the correct reading for your model number. However, these moving parts, to stay moving, require a substantial amount of compression. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Check the tension 2. chain saw compression release mod. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Try it, it may just do the trick! 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! after that I'd be looking at crank bearings. A two-stroke gas-powered chainsaw uses relatively few moving parts. Pull the rope until it starts. You should also make sure the new gas you use is appropriate for the chainsaw. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Get you some Sea Foam at the local auto parts store. 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. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Get it ported and it brings it to another level. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. You can prevent the new starter rope from fraying by burning the two ends of the rope. When the motor warms up after about a minute, turn on the choke position. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. It is best to put a new plug in after clearing. Low pressure, 20 to 30 pounds is all you need. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. }, Reddit and its partners use cookies and similar technologies to provide you with a better experience. You can unclog the carburetor if the clog is minor. Any ideas? Pull the starter rope until you hear the first sign of it firing with a small burp. 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! In addition, you should check the muffler and piston while youre at this point. Remove the entire carburetor and clean it. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. As a result of using bad fuel or leaving fuel in the chainsaw for a long time, the fuel evaporates and leaves behind a sticky substance that accumulates and clogged the carburetor. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. "image": { When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Don't know what to do at this point. lol. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. Wipe off the excess fuel from the spark plug with a clean rag. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. 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.. Remove the filter, engine control lever and Stihl carburetor. Oct 24, 2011 / Chainsaw excessive compression #1 . Then Google decarb . Fine adjust everything and both saws start Normal now. Please use the navigational links to explore our website. $20.00 shipping. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. It is significantly tougher to pull over than an 024 or the new 241. The following have been addressed. You are misunderstanding WHY water is put into carboned up engines. It's from not pulling hard enough. 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. . Do that to the starter side when you're looking at the starter assy. Try blowing the crankcase out with air. 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. 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. I'm hearing thats just the nature of the beast. When the engine starts running, turn the choke off. Carboned rings will decrease not increase compression. Turn the engine to get under the piston and blow the crankcase out. 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. The exhaust side of the piston is a warm gold. It works when cold-starting the engine, when the engine is idle and when the engine is open. Runs well, except it. High compression in chainsaws is a dangerous problem that can lead to serious injuries. 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. Stihl oil has been used. You never try to get it to run with the choke on. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . All it needs is a few inches missing and it will pull too hard like the compression is too high. Use recommedend chain oil lubricant. Make sure the gap is according to the specifications of your chainsaws engine. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", 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. "height": 57 "dateModified": "2017-08-17", A drastic and frankly silly thing to do though . This is bad practice, and can damage your chainsaw. Once it's removed, you can place a gauge on the place of the spark plug. Carboned rings will decrease not increase compression. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. Check for side play in the crankshaft. I bought 2 032 Stihl saws at auction that pulled very hard. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. If oil is in there it is what makes the engine feel like it is almost locked up. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Suitable Replacement Stihl MS 250 C Compression Release Parts For a better experience, please enable JavaScript in your browser before proceeding. My one and only MS250 was a kicker to start it but that was the only problem. If it does maybe it is plugged. If it does maybe it is plugged. Can anyone make a suggestion. That is what was told to me by the area distributor technician Check for side play in the crankshaft. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Register today and take advantage of membership benefits. Any chance is it hydro locking because of gas? 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. Turn off the choke by pressing the control lever to activate the fast idle. I would suspect the timing is too early. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. I would suspect the timing is too early. Trying to rotate the chain while a huge piece of wood is . or Best Offer. To test the recoil starter, remove it and reposition the spring. 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. Turn the engine to get under the piston and blow the crankcase out. #3. "@type": "InteractionCounter", Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. I think that's what I'd do. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. Another big issue that causes too much high compression is the lack of oil in the starter system. 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?? "@type":"DiscussionForumPosting", "headline":"Chainsaw has too much compression", Oct 7, 2019 / Minimum compression for a Stihl 2 cycle #3 the actual numbers will vary from one tool to another Getting accurate numbers without special tools is quite difficult because of the small volumes. Mar 22, 2017. Therefore, most people will wonder why the chainsaw has too much 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. My name is Chris Ross. Generally covering everything under 25 HP. 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. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Would not be afraid to do it to a 4, 6, or V-8. Replace the spark plug with a new identical. That is what was told to me by the area distributor technician That is the nature of a 250. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. If the air filter is too clogged, you should replace it. It is typical for the Stihl chainsaw to develop some issues, and when this happens, some basic troubleshooting will help identify the source of the issue and solution to help it run smoothly. Compression is measured by using a simple screw-in gauge. It's also possible the piston or cylinder are scored or carboned up. "@type": "ImageObject", If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. It would give you rusted bearings. There is no idle when I release the trigger. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. 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. The other cause of your chainsaws high compression could be the stuck ignition rope. "@context":"https://schema.org", Rinse the filter and allow it to air dry before reinstalling it. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! It's also going to be wise to try to put the chainsaw somewhere that isn't exposed to constant sunlight since that can be a contributing factor to the oxidation. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. 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?? 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. Check the spark plug and replace it if needed. 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. "@id": "https://www.yesterdaystractors.com/" I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. I went with a meteor piston/cylinder set. If the chainsaw is too little compression, it may start easily but will not run smoothly. I used to have a Homelite that would do that if I left gas in it. That is the nature of a 250. 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. 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. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. A heavy-duty engine gets hot faster and works better than a cold engine. So be sure to keep your chainsaw properly maintained and avoid compression problems. The saw feels good in my hands and its got a surprising amount of power. Could your gauge be off a little? If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. As the starter, spring plays a vital role in running starter assembly smoothly. If you could start an engine with the choke closed and not turn off the choke on time, you will end up flooding the engine with too much gas. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. 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. 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. "datePublished": "2017-08-17", It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. 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. If I drop start it I can pull it through 1 compression stroke. In a similar vein, if the wrong kind of oil is used, the compression may be increased. This could be understood by reading the further explanation below. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Didnt somehow get straight oil in the cylinder did you? Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. What ratio mix is he using? Create an account to follow your favorite communities and start taking part in conversations. Check the chainsaws fuel if you have not used the tool for a while. Try taking it out, Then holding the trigger while you pull fast. Wipe off any dirt and debris and check for any signs of damages. Don't put water into the 2 stroke. 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. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. It would give you rusted bearings. I think that's what I'd do. { Indoor fly traps are an effective way to keep insects away from your home. Blup throttle to bring it down to idle. 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. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. My chainsaw has gotten very hard to pull the rope. Each chainsaw has a different level of compression. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. It is harmful to your machine to use old fuel. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. It was metering lever. Make sure it's greased and the bushings are good. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. "@type": "Organization", Cleaned it all up, and had it tuned up. Turn the engine to get under the piston and blow the crankcase out. We and our partners use cookies to Store and/or access information on a device. Also check the air filters and make sure they are clean. First, remove the spark plug from the chainsaw. in the. "@type": "ImageObject", I've seen a 20psi drop with the wrong type of gauge to be pretty common. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 24" is what I've got on mine, but it can handle a bigger bar. Without proper compression, the engine will not be able to suck and use the fuel for combustion. 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. However, you still have to confirm the size of the gap before installing. runs way too fast. The exhaust is black but no build up. 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. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. You may also want to go ahead and replace the plug. Take off the muffler or the carb to get access. If the compression is too high or too low, the engine wont start. Locate the tension adjustment screws to the side of the chainsaw guide bar. Sometimes it kicks and the rope pulls right out of my hand. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. Not sure it would accomplish anything on a 2-stroke chain saw engine. no, afraid I don't have equipment to test. No carbon on top or on roof of cylinder. You are misunderstanding WHY water is put into carboned up engines. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. I missed the "no carbon". Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Try blowing the crankcase out with air. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Old contaminated chainsaw fuel Chainsaw Starter rope issues Faulty spark plugs Chainsaw Carbon buildup Insufficient Chainsaw Oil Old and contaminated fuel Quoting Removed, click Modern View to see Don't put water in the saw-ever. People sometimes try to cut down a tree that is too big for their chainsaw. Your ignition rope must be intact properly with the pulley to work correctly. 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. I've done it to high hour Kohler engines many times. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. 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. $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 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. "height": 57 Also check the air filters and make sure they are clean. 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. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. 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. My /Sthil 034 is very difficult to start. You need to pull the exhaust to check that. 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. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. (there is some play when flywheel on shaft (nut not attached) 3. tank and oiler vents are operating 4. exhaust has been removed and spark arresting screen checked (clean) 5. piston/walls checked.. no scarring ProTip: You can use a small air compressor to blow air through the air filter and get rid of the loose dust before proceeding to clean it further. On a 2 stroke the water would go into the crank case first and pool up. or Best . Mar 24, 2019. I tried draining the crankcase with the saw upside . No compression when pulling start rope. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. The power of the motor of an engine is measured in its capacity. 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. It is like there is too much compression. Welcome! Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. Spark plugs that are not functioning properly are another probable cause of excessive compression. Check for broken teeth on the chain and replace them if necessary. Therefore, it does not need any compression rate to start. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. You will notice the compression less. If the chainsaw engine dies when you release the throttle, turn the low-speed screw with a screwdriver clockwise until it stops and then turns it counterclockwise once. 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. John Deere and its logos are the registered trademarks of the John Deere Corporation.