Mercury Snowmobiles Discussion Board

Thanks for the help but in the meantime I pulled the flywheel and cleaned up my points. Put it all back together and now I have no spark at all. I was stunned... all I did was clean up the points and re-assemble. It makes no sense. Does anyone have a wiring diagram for this sled.

I have a 1975 Merc 440 S/R. It always fouls a plug (same one every time). I replaced a bad crank seal on the fouling side, coils are good, good compression, new headgaskets, good plugs boots wires, reeds aren't cracked, carb has been rebuilt, flywheel key looks good, and I'm all out of ideas. Any he...

Do you still have your Merc and spare motor?