Compression results

[marauder11]

Ok someone who knows please explain this to me. 135 135 135 130 was the numbers 1 thru 4. I have an 1986 johnson 120.
Why would the number on the fourth be 5 less than the other three. What causes this. Is this a sign of future issues.

 

[ajgraz]

Re: Compression results

I don't see any problem there.

 

[marauder11]

Re: Compression results

I don't see any problem there.

I am not saying there is an issue. Not a motor head. Just wondering why the differance and causes of such. Just trying to learn.

 

[JB]

Re: Compression results

Probably trivial and unimportant differences when you took the measurement. Your engine is very, very healthy.