I seriously doubt there's anything up with his clutches, It sounds like a spark plug issue to me. So I'd say buy a new pair, put em' in, and see what happens!
95' ski doo Mach z 780 triple (stock)
98' ski doo formula sl 500 (Stock)
98' Arctic cat 440 Jag (studded)
00' Mxz 700
1992 Ski doo Mach 1 (DG pipe)
1976 El Tigre 5000
1972 Arctic Cat Panther 440
"Ride em' till you can't feel your toes"