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therocket

Briggs Compression Test

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therocket

I took compression tests on my 3 1975 Simplicitys and came up with the following numbers with throttle wide open and engines cold:

7010 = 108psi

7013 = 98psi

7016 = 110psi

Are these good numbers cold or should I have checked compression with the engine hot?

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MikeES

Just experience with one engine...it had only 60psi and was hard starting and hard to get revved up. I believe that with that low compression it had a hard time sucking up the gas fumes through the updraft carb.

Other wise all my other Briggs engines are 95 to 120psi, and no issues.

So my best guess is that 70 to 75 may be the threshold. ?

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