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My best guess would be about 5-8 mph
.035
50:1
The sticker on the side of my 6hp two stroke Suzuki OB reads 100 to 1. Unsure of the year.
Model number 6303, would be a 1973 year model, 6hp Evinrude outboard.
Johnson 6hp spark plug gap
50.6
it weighs 27kg
The correct plug gap for the 1971 model, 6hp Johnson outboard, is .030-.035 in. It requires a Champion J6J, or NGK B6S.
I once had a 6hp motor on a 10ft aluminum boat. It worked well with one man aboard, but had a hard time planing with two people in it. I would say on a lightweight boat of 8ft or less, it should work alright. You won"t be a speed demon, but it should work for a one man rig.
50:1
RJ8C Champion