just got my 73 nordic running it has a 339 rotax not original and im fouling plugs im running 50 to 1 ittl run great for a couple of laps then one of the flugsll foul alsoit has a reverse gear what kinda lube do i use fer it
in the chaincase, use your favorite 90wt oil. In my 399 Nordic I use 20:1 with no problems. Most likely your jetting is too rich. Start with the low speed at 1 turn, and high speed at 3/4. adjust acordingly. For plugs, I use NGK B8HS.
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