i have a 1987 trail boss 250 i have to rev it up to get it to move its like the clutch is sticking what would cause this if u nail it it take of good no slipping but if u try to take off slow it revs up then jerks and takes off i took the cover off and watched while it was running when i hit the gas the clutch doesent move till about half throttle should u be able to move primary clutch in and out by hand mine seems to hang up when trying to move it

 

does it have a aftermarket spring in the drive clutch? those act like a stall converter. gives you more bottom end than speed. does the clutch come all the way out after it does engage and shut the motor off or can you grab the outside sheave and pull it the rest of the way out?

that spring in there will keep you from moving it too much inward and you shouldnt be able to pull it towards you unless the clutch is wore

 

you may what to take the clutch off and take it a part and check for worn bushings as if they get worn to bad they will kick sideays and hang up some.

 

Belt dust and a good cleaning on both clutches would be in order. Replace the buttons in the driven, use some scotchbrite on the sheaves, new belt, springs should be replaced if they have been on the clutches and under load during the off season

 

when you take it apart for cleaning as mentioned, check the weights and rollers as well for wear. not so much on a wheeler, but sleds will wear clutch parts i have mentioned to behave as you mentioned. let us know.

 

check the color of spring in the clutch (may have to look on the end)