Motorcycle Questions? Ask a Mechanic.
Sounds like its a rough ride. Either have a damage/bad drive belt or primary clutch stall spring is incorrect, or secondary clutch adjustment is off. The Polaris 570 has 2 clutches. Primary clutch has a stall spring which controls what rpm the clutch will begin to engage and grabbing the belt. with the clutch cover off and machine off, pushing on the face of the primary clutch you should have a around 4mm of free play. As for the secondary clutch the belt should be about 4mm above the rim of the clutch.