For a 1970 OMC 6HP engine, the recommended spark plug is the Champion J6C or an equivalent plug
Per Champion spark plug applications chart, the gap for 6hp Tecumseh engine is .030
It is 0.030" for an L-head engine.
Johnson 6hp spark plug gap
.035
The correct plug gap for the 1971 model, 6hp Johnson outboard, is .030-.035 in. It requires a Champion J6J, or NGK B6S.
45 thousands to 60 thousands, if you dont have a gauge use a match book cover, its 45 thousands thick, small engine mech,
It is usually a Champion plug RJ19LM. The gap is .030 inches. This plug is usually used with B&S engines from 3hp - 6hp.
If you are using NGK plugs, the plug model is BP6HS and the gap is 0.035. I had to look it up also for my 6HP Suzuki outboard on my sailboat.
RJ8C Champion
50:1
6hp 5 3/4 horse is correct
You do not need a Skippers Ticket if the motor is UNDER 6hp. If it is 6hp, then you DO need a Skippers ticket. Our website has all the details about skippers tickets, plus there is a wikipedia page on it too.