compression?

[314epw]

What is the average compression of a chainsaw?
Ed

 

[rmihalek]

I'd guess around 160 psi.

 

[Lawn Masters]

This depends on the saw in question. most machines should be in the 160 range.

 

[314epw]

compression

should the engine be hot or cold
Ed

 

[Lakeside53]

Hot is best, but hot to cold maybe 10 psi difference, or less. Some engines will show more range if they have thick oils or mixes, but if you are in the range of 145 to 160, it's at mid life, typically. Unfortunately compression is only one measure. It's possible to have great compression, but a lousy piston/cylinder due to inlet skirt wear.