Compression testing conditions for outboard.

[Silly Seville]

Is it the same for 4 stroke automotive engines? I ask because I'm perusing this forum trying to learn as much as I can about my new-to-me Johnson 85 hp V4; and need to know what I should expect from the readings to decide if this engine is healthy enough for service. It is not actually running yet as I need fuel lines and such, but I did perform a cold compression test (40 degrees in garage) and am getting 115-130 psi. Can I safely assume that those are good readings since cold temps typically result in low readings? BTW, I did squirt oil into the cylinders during each test to prevent scuffing a cylinder due to lack of lubrication. I also held open the carb butterflys manually. Other than the cold test conditions, did I do everything correctly?

Thanks!

 

[F_R]

Re: Compression testing conditions for outboard.

I understand why you oiled the cylinders, but that is cheating where compression testing is concerned. The readings you got probably are good enough to proceed, but not real accurate.

BTW, blocking the throttle open is NOT necessary on a two-stroke. Nor does it do any harm. Just doesn't do anything except waste your time and effort..

 

[boobie]

Re: Compression testing conditions for outboard.

Got a model # ??