Load Snowmobile Pickup Snowmobile Problems 1994 ZR 700?

Snowmobile Problems 1994 ZR 700? - load snowmobile pickup

I have a ZR 1994 700 Marsh load, basically you can buy the book and there are plenty of snap, but they put it under load. It also shows that the heating is only for a short period. I changed spark plugs and cleaned both of carbohydrates and found no change. I also thought at the beginning of spring clutch can be broken and replaced, no results. Ideas?