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The sticker on the side of my 6hp two stroke Suzuki OB reads 100 to 1. Unsure of the year.
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.
Model number 6303, would be a 1973 year model, 6hp Evinrude outboard.
.035
50:1
1979
Per Champion spark plug applications chart, the gap for 6hp Tecumseh engine is .030
year of manufacture 1984 Belgium derated (from 6hp) long shaft Try BRP.com for parts
1969 6hp
Johnson 6hp spark plug gap
it is a1969
My best guess would be about 5-8 mph