1975 rude 85

S

smith88

Cadet
Joined
Aug 25, 2011
Messages
15
compression different from top 2 and bottom 2 cylinders.top 85 bottom 100.Could this be air leak,reeds,rings?
 
RandyJ

RandyJ

Master Chief Petty Officer
Joined
Jun 13, 2002
Messages
808
Re: 1975 rude 85

How different? More than 10%? Rings? Scored/scratched cylinder walls....?
 
S

smith88

Cadet
Joined
Aug 25, 2011
Messages
15
Re: 1975 rude 85

top 85 bottom 100, just seems strange that the two low cylinders are the same.
 
iwombat

iwombat

Captain
Joined
Jul 12, 2006
Messages
3,767
Re: 1975 rude 85

You probably had float/jet issues in the top carb at one point and ran those cylinders dry for a spell. I'd crack open the heads and take a look if it were mine.
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1975 rude 85

According to the old OMC Specs you're right on the line. Before you take it apart do a GOOD decarb on it and then check compression again.
 
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