Valv
Petty Officer 1st Class
- Joined
- Jun 12, 2001
- Messages
- 391
I have a early '80s 70hp Mercury outboard, 3 cylinders. Motor runs good at higher rpm (2000 and above), but when idling it has a knock (like valve knock on truck engines) and idles a little rough. Compression is ok (110,120,105). I am currently using motor and find no problem with it, but I'd like to sell it for a bigger one and don't want to mess up anybody. I fugured if it's a rod, it should have blown off by now, I am using motor for past month.<br /><br />Other question: is this motor practically half of a 6 inline 140hp ? (same pistons, rods, rings, etc.) ?<br /><br />Thanks.<br /><br />Val