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I looked at the motor a little more and the pistons and cylinders look pretty good except there is a big gap (about 0.030") between the cylinder wall and the piston on both cylinders. The rings are not stuck and make up the gap. I measured the cylinder ID and got 2.380" when it should be...
The compression testing kit came in today, so I measured the compression on the motor. I used a cordless drill on slow and then fast speed to turn the flywheel to check the compression. This is what I got:
Top cylinder:
Drill in slow speed: 65 psig
Drill in fast speed: 105 psig
Bottom...
It was leaking around the thermostat cover, so I pulled the cover off and was surprised to see that the thermostat was missing. Maybe that didn't cause too much damage.
Hi, I have a 1994 15 HP Johnson, model # J15RERE, that is hard to start and has a rough idle. It runs great if I can get it started and get it above an idle. It will push my 14' jon boat about 19 mph (2 mph faster than my 1986 15 HP Evinrude).
My dad traded up this motor and gave it to me...
