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Compression on a 1975 115 evinrude

J

jmann

Contributing Member
i have a 115 evinrude that has

i have a 115 evinrude that has 120# of compression on the port side and 150#con the starboard side. is there any concerns here?
 
"150 kinda surprises me,....do

"150 kinda surprises me,....do a de-carb w/seafoam,etc in fuel tank,..tune it up and run it...comp on port may come up."
 
I would pull the heads or at l

I would pull the heads or at least the starboard side and do a decarb
150 is too high!
If you dont do it predetonation from too high compression will distroy your engine!
Redo the starboard carbs as something is wrong!
 
spayed seafoam in the cylinder

spayed seafoam in the cylinders and the port side has 120 and 130 the starboard side is 140 and 140. should i just go ahead and replace the rings.
 
The seafoam may have give you

The seafoam may have give you the higher numbers.
Check again after you run it and if you still have any high ones you may still have carbon build up that you may want to deal with!
 
run another can of seafoam thr

run another can of seafoam thru it mixed with the gas..its also possible that the gauges are a little high..it also depends on whether the motor is hot or cold when you check compression...i would give it a long run(several gallons of the seafoam/gas mix) at or near top rpm...then use it and enjoy..
 
some difference between the st

some difference between the starboard and port side on compression is normal on that engine is normal..
 
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