Ok, recently aquired a 71 johnson 60 hp on a 16ft v-hull glastron. Starts easy, idles pretty well, put it in the water and cruise-just about 5 mph! Never planes, never devlops over 2000 rpm (guessing no tach.)
Compressions- 120,120,120.
Spark is strong bright white, plugs are new.
No. 1 plug is...