35hp evinrude lark 1959,starts fine but seems to run rich on bottom cylinder

N

not outboard savvy

Recruit
Joined
Sep 13, 2010
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topcylinder runs warm and clean,bottom cylinder runs slightly cooler and wet. commpression seems ok, good spark. engine had not been ran for 2 yrs after carb rebld. maybe a gould clean out or rebld carb again?
 
oldcatamount

oldcatamount

Lieutenant Commander
Joined
Apr 4, 2010
Messages
1,740
Re: 35hp evinrude lark 1959,starts fine but seems to run rich on bottom cylinder

Make sure you have both of the spark plugs gapped at the same setting. Look for a cracked plug wire to that cylinder or the coil may be weak for that cylinder.
 
F

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: 35hp evinrude lark 1959,starts fine but seems to run rich on bottom cylinder

The bottom cylinder drives the fuel pump. If the fuel pump diaphragm leaks, it will flood the bottom cylinder.

Remove the pulse hose from the pump and squeeze the primer bulb. If gas squirts out the pulse hose, you have found the problem. (The pulse hose is the one going around the rear of the head, to the other side)
 
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