Some individual engines may run a bit higher or lower and the temperature of the tool can affect readings. Subsequently, question is, how much compression should chainsaw have? According to Stihl USA, the minimum compression reading for their chainsaws should be around 110 psi. The lines run from the tank to the carburetor and back again. If this does not solve the problem, it may be related to excessive fuel caused by problems in the gas lines and filters. ![]() Old or bad fuel can cause lots of headaches with yard equipment. Many problems with compression are related to fuel. Gauges come in varying sizes, so you may need to use an adapter between the gauge and chainsaw.īesides, what causes too much compression in a chainsaw? Remove the spark plug using a ratchet and place the gauge in its place. ![]() You can test compression easily with a simple compression testing gauge.
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