stihl chainsaw too much compression

Wipe off the excess fuel from the spark plug with a clean rag. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. What ratio mix is he using? 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, (quoted from post at 00:57:42 08/18/17) My chainsaw has gotten very hard to pull the rope. You need to pull the exhaust to check that. It's from not pulling hard enough. 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. Get you some Sea Foam at the local auto parts store. Pull the starter rope until you hear the first sign of it firing with a small burp. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Soaking in water will do nothing but rust things up . lol. By checking & repairing/replacing these, you can fix the issue. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. read more Vince O. water will not dissolve carbon; it is far too hard to be effected. Any ideas? Each chainsaw has a different level of compression. Register today and take advantage of membership benefits. 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. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. The engine creates a vacuum pressure inside it. It's also possible the piston or cylinder are scored or carboned up. Can also be used with hedge trimmer attachment HS 246. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. "width": 200, When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. "@type": "ImageObject", Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. Does the saw have a compression release? When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. I would never put water in it! There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. It would give you rusted bearings. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. 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?? Thanks! You will notice the compression less. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. If it does maybe it is plugged. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Make sure it's greased and the bushings are good. 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. Check the spark plug and replace it if needed. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Once it's removed, you can place a gauge on the place of the spark plug. Dont substitute it with. Unscrew the clutch assembly on top of the oil pump. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. All it needs is a few inches missing and it will pull too hard like the compression is too high. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. Sometimes, this might be triggered by another problem that is impacting your system. Posted December 27, 2017. 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. A drastic and frankly silly thing to do though . Also check the air filters and make sure they are clean. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. or Best . Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. Sometimes the spring stops working correctly due to overuse and becomes brittle. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. 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. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. I used to have a Homelite that would do that if I left gas in it. You can check the compression by pulling the spark plug out and holding it in your hand. Fine adjust everything and both saws start Normal now. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Pull the rope until it starts. The plug should be tight against your thumb. "image": { If oil is in there it is what makes the engine feel like it is almost locked up. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. I;ve read somewhere to put water? It works when cold-starting the engine, when the engine is idle and when the engine is open. Other Professional Battery-Powered Chainsaws We Recommend: Stihl MSA 220 C-B 36V 16-inch Chainsaw: Solid design and increased power backed by Stihl's dealer network. "@type": "ImageObject", 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 power of the motor of an engine is measured in its capacity. . The saw runs and starts great. I think that's what I'd do. after that I'd be looking at crank bearings. So be sure to keep your chainsaw properly maintained and avoid compression problems. 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. Ask him if he's drop-starting it. This could be understood by reading the further explanation below. Here is a link for two stroke engine air cycle. First thing I'd check is the pull start assy. A drastic and frankly silly thing to do though . If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. $49.99. I have a MS250 that has come up on compression since new. Other than that, you should also use the correct spark plugs for your chainsaw. Compression is measured by using a simple screw-in gauge. Can anyone make a suggestion. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. A two-stroke gas-powered chainsaw uses relatively few moving parts. I went with a meteor piston/cylinder set. A very loose chain will cause the blades to come out of the bar, while a very tight chain is also not ideal for the proper functioning of the chainsaw. However, these moving parts, to stay moving, require a substantial amount of compression. The saw is about 2 years old, light use. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug However, you still have to confirm the size of the gap before installing. It would give you rusted bearings. after that I'd be looking at crank bearings. Hope this helps. 24" is what I've got on mine, but it can handle a bigger bar. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. 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. 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. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. The early 064, 044, 066 came with a red master control. Use a brush and cloth to clean and remove any dirt, mud, or debris that can interfere with the controlsclean around the chain brake lever, the air filter housing, and the filter. If the chainsaw is too much compression, it may be difficult to start. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. runs way too fast. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Currently I live in Austin, United States. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. "userInteractionCount": 23 Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Would not be afraid to do it to a 4, 6, or V-8. Hello. Are you sure the starter rope isn't a little too short? pulls with little resistance, similar to my farm boss. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. When you start your chainsaw, the crankshaft spins, creating vacuum pressure on the carburetor, pulling the gas from the tank and into the combustion chamber where it mixes with air and ignites. idle. You are misunderstanding WHY water is put into carboned up engines. Rinse the filter and allow it to air dry before reinstalling it. I used to have a Homelite that would do that if I left gas in it. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Unscrew the spark plug wrench using a spark plug from the engine. I can probably find one with at most 65 PSI. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Manage Settings Finally the fuel will be converted into energy. It is harmful to your machine to use old fuel. To inspect the guide bar, disassemble the chain cover, chain and bar. 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 "@id": "https://www.yesterdaystractors.com/" Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Versions MS 260, Bar length 37cm, RSC The manual for this model, and the parts breakdown, show a compression release valve. The other reason might be the use of the wrong type of oil for the climate. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. To test the recoil starter, remove it and reposition the spring. 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. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start.

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