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. 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. 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. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . The carburetor is a significant part of the chainsaw. I have plenty of engines with REALLY low compression that I'll be glad to swap him. The exhaust side of the piston is a warm gold. It prevents the carburetor from allowing too much fuel into the combustion chamber. Another big issue that causes too much high compression is the lack of oil in the starter system. My name is Chris Ross. It works when cold-starting the engine, when the engine is idle and when the engine is open. The exhaust is black but no build up. A highly compressed engine will not be able to work smoothly because of the too much pressure on engine and you will find it hard to start the engine. You need to pull the exhaust to check that. #3. Cleaned it all up, and had it tuned up. 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. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. 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. Therefore, most people will wonder why the chainsaw has too much compression. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. "datePublished": "2017-08-17", Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Would have to remove spark plug and rinse cylinder with gas to be able to start. I missed the "no carbon". 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! Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Remove ignition coil and muffler. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. Admitted Woodaholic. I went with a meteor piston/cylinder set. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Obviously, the motor, which has a huge capacity, will require more compression. In addition, you should check the muffler and piston while youre at this point. "@type": "InteractionCounter", I love to write about chainsaw for homeowners and professionals. A 50CC engine needs 150 PSI compression. Could your gauge be off a little? It does not take much to increase the compression. I hope my epic guides will help you to choose,buy and maintain chainsaw. 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.. 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. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. 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. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 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. Clean any mildly dirty parts and replace all the damaged parts. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. Check for clogged shafts and jets, clogged carburetor, damaged valves, stuck levers, and damaged or warped diaphragms, all of which can interfere with the fueling process. 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. It would give you rusted bearings. idle. If it does maybe it is plugged. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Every chainsaw needs to have some compression to ensure that it operates well. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Carboned rings will decrease not increase compression. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. 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. On a 2 stroke the water would go into the crank case first and pool up. First thing I'd check is the pull start assy. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Make sure it's greased and the bushings are good. Don't know what to do at this point. Generally covering everything under 25 HP. Take off the muffler or the carb to get access. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) "dateModified": "2017-08-17", Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. Let saw run until its warmed up, and go cut wood. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. }. Then Google "decarb". When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. I've seen a 20psi drop with the wrong type of gauge to be pretty common. You will notice the compression less. Check if the wires are damaged or broken and replace them if necessary. Move the selector lever up one position immediately or the saw will flood on the very next pull. I changed to synthitic. Thank you for the responses. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. I have a MS250 that has come up on compression since new. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. If any part of a carburetor has issues, the right amount of fuel/air mixture wont pump into the chamber, therefore, preventing the engine from starting. Therefore, it does not need any compression rate to start. "@type": "WebPage", 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. { 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. Getting these problems resolved is a rather straightforward process. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. But it was stolen along with other tools around 1990. Soaking in water will do nothing but rust things up . "name": "Yesterday's Tractor Co.", It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Remove the right side cover, bar, and chain. External air goes into the engine through the air filter to cool down the chainsaw engine and also mix with the fuel to ignite and run the saw. It had a compression release, and it started and ran well. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. Don't put water into the 2 stroke. Remove the sprocket and the washer. 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?? As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. My /Sthil 034 is very difficult to start. A large engine has a huge capacity in its motor. Make sure the gap is according to the specifications of your chainsaws engine. Doesnt pull at all or just hard to pull. i have a ms 250. You are using an out of date browser. }, Versions MS 260, Bar length 37cm, RSC When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Indoor fly traps are an effective way to keep insects away from your home. Don't put water into the 2 stroke. 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.. Try taking it out, Then holding the trigger while you pull fast. Are you sure the starter rope isn't a little too short? The switch might be damaged or the motor is burned out. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. You can check the compression by pulling the spark plug out and holding it in your hand. ", water will not dissolve carbon; it is far too hard to be effected. I used to have a Homelite that would do that if I left gas in it. I used to have a Homelite that would do that if I left gas in it. Stihl chainsaw low compression diagnoses and How To Dave's Small Engines 8.89K subscribers Subscribe 17K views 2 years ago This video shows a Stihl MS310 chainsaw I have apart from low. Cylinder Compression Plug Applicable Model For STIHL 021, 023, 024, 025, 026, 044, 046, 066, MS210, MS230, MS240, MS250, MS260, MS341, MS360, MS440, MS460, MS650, MS660 Chainsaw Parts Refer To Part No. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Use of this Web site constitutes acceptance of our. Then Google decarb . However, you still have to confirm the size of the gap before installing. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon.
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