1978 Evinrude 115 Compression numbers = rebuild?

interalian

Commander
Joined
Jul 23, 2009
Messages
2,105
On the low side but gauges can vary - try with another gauge? The 20 pound difference between highest and lowest is a concern - is that 90 reading on the lowest cylinder?

Oh, and is this a new-to-you motor or one you've had for years?
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,483
Remove bypass cover on the bad cylinder.---Inspect pistons / rings.----If you keep running it you may do big $$$ damage.
 

coin operated

Seaman Apprentice
Joined
Jul 30, 2009
Messages
35
It is new to me. I actually haven't purchased it yet.The low reading is on the starboard lower cylinder.
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
You can also do a good de-carb on it. You may get a surprise.
 
Top