gjmsd
Petty Officer 3rd Class
- Joined
- Oct 18, 2010
- Messages
- 83
I recently bought a 1983 Johnson 115 w/ tilt and trim and control box to replace my 1975 Evinrude 135 w/ manual tilt and trim. The newer engine has lower compression compared to my 135 (130 psi for the 135 vs. 85 psi for the 115). Even though it needs work, I couldn't resist buying it cause the guy (who I know personally) was only asking $100 for it because he needed money quick. I gave him an extra $50 to help me remove it so I'm only in it $150 and figure worst case, I could get more parting it out.
A good running 115 should be adequate for my little 16' speed boat and I really want to get tilt and trim. In order to be happy with the 115, I think I want to get the compression up but want to make sure the rest of the engine is in good enough shape to justify the work. My other option is to find a 1975 tilt and trim and continue using my current engine. If I go with the 115, what all should I look for to evaluate the motor's parts. How likely is honing and re-ringing the of the pistons going to be in raising the compression to an acceptable level. In fact, what is an acceptable level? Keep in mind, the only compression tests I did were on a cold engine that had been sitting for about a year so running it a bit (if I can get it started) and letting it warm up may seat the rings better and raise it.
I have a good running 135 now and the whole off season to work on the 115 so I want to do it right and make it a nice engine if the rest of it is worth it.
Any recommendations would be greatly appreciated.
A good running 115 should be adequate for my little 16' speed boat and I really want to get tilt and trim. In order to be happy with the 115, I think I want to get the compression up but want to make sure the rest of the engine is in good enough shape to justify the work. My other option is to find a 1975 tilt and trim and continue using my current engine. If I go with the 115, what all should I look for to evaluate the motor's parts. How likely is honing and re-ringing the of the pistons going to be in raising the compression to an acceptable level. In fact, what is an acceptable level? Keep in mind, the only compression tests I did were on a cold engine that had been sitting for about a year so running it a bit (if I can get it started) and letting it warm up may seat the rings better and raise it.
I have a good running 135 now and the whole off season to work on the 115 so I want to do it right and make it a nice engine if the rest of it is worth it.
Any recommendations would be greatly appreciated.
