Mercury Snowmobiles Discussion Board

I have replaced a bad crank seal on the clutch side and still there is no change. It always fouls the same plug. Coils, wires, boots, plugs (NGK BR8ES), are all good. I buy new plugs it just runs for a bit and then the one plugs craps out. Reeds are good too. All out of ideas.

I have a 1975 Merc 440 SR. The sled runs but fouls a plug all the time. It has good comprssion, the flywheel key is ok, the carb has been cleaned and rebuilt. Whats the deal?

Hey, email me at (email removed by moderator). I live in Steinbach and I have some questions if you still have your sled and motor.