Possibly the crankshaft seal behind the clutch and the one behind the flywheel is sucking air. Occasionally the center (labyrinth) seal of the crankshaft blows through side to side so you're not transfering the fuel air mixture at the proper time. I realize the origional ski doo snowmobiles are supposed to have Bosch spark plugs. Try cross-referencing over to a pair of NGK's. The capacitive discharge ignition plate behond the flywheel may have loostened-up so the ignition timing isn't correct.
Are the ignition wires and boots in good shape? Is the fuel pump forcing fuel to the carburetors?I have a 1980 ski doo 5500 blizzard with twin carbs. its getting spark and fuel but it wont start. help please?
Did you change the spark plugs? Maybe the timing is off.
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