Compression on cold engine ?

[barrrj]

I have a 93 johnson 115 which I cannot get started, What would the compression readings be for a cold engine, in the faqs it says warm engine up, which i cannot do.

Thanks

 

[bignefan]

Re: Compression on cold engine ?

I did my test cold then warmed up there wasn't but 2 to 3 LBS difference

 

[jonesg]

Re: Compression on cold engine ?

its probably to ensure the engine will spin fast enough.
As long as the battery is good, I do mine cold anyway.
Never noticed much difference, but seafoam will make a difference.!

 

[GeneH]

Re: Compression on cold engine ?

I would guess something in the 110-125 range and even within 10-15 lbs, the closer the better.