Small Engine Repair: Homelite Chainsaw Compression Test Piston Rings Cylinder Damage

!±8± Small Engine Repair: Homelite Chainsaw Compression Test Piston Rings Cylinder Damage

**Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.** The Homelite Chainsaw in this video is over 30 years old. It had a carburetor problem, which caused the air fuel mixture at top speed to be lean, and this caused the chainsaw to over heat and lock up. I was able to free the piston by spraying penetrating oil into the cylinder, and now the chainsaw runs again. However, the piston, rings and cylinder have signs of damage caused from the engine over heating, but the compression ratio is still very high. The compression ratio is close to 150 psi. If you knew nothing about this saw, and performed a compression check, most mechanics would assume the top end is in good working order. This goes to show that you can't always assume the top end is ok when the compression ratio is high. It requires a visual inspection. On small 2 stroke engines used on outdoor power equipment an easy way to see damage on the piston and rings is to remove the muffler and look at the piston and rings through the exhaust port.

Small Engine Repair: Homelite Chainsaw Compression Test Piston Rings Cylinder Damage

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