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Carboned rings will decrease not increase compression. You are using an out of date browser. On a 2 stroke the water would go into the crank case first and pool up. 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. The saw runs and starts great. I got it started. I have a MS250 that has come up on compression since new. Fine adjust everything and both saws start Normal now. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. "@type": "Person", The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. 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. 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. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. The saw runs and starts great. 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. It may not display this or other websites correctly. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. $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 I would suspect the timing is too early. Move the selector lever up one position immediately or the saw will flood on the very next pull. I used to have a Homelite that would do that if I left gas in it. Please use the navigational links to explore our website. 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! The owner is complaining of hard to pull start. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. "@type": "ImageObject", Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. And some will have more. It is harmful to your machine to use old fuel. Ron Cook. When there is too much fuel, it will not ignite, and the engine wont start. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. We got rid of both of those useless things . 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. If the starter spring is keep working correctly, it will retract the ignition rope.