pratt_man1
Cadet
- Joined
- Jun 3, 2010
- Messages
- 13
I have a 1965 evinrude 40 hp motor. Took top spark plug out and it was melted bad. Took cover off so i can retap threads and found top of piston pitted and not shapped the same as the lower one. compression is still good. Do i need to replace it or adjust the gap on my new spark plug. Any thoughts of what caused this? Any help would be greatly appreciated.