HELP.. jumps into gear, but one way bearing is correct.

First post! what whattt

Alright.. so I bought my 2008 grizzly 660 this summer for $1800 (the price told me it was going to need some work). Mainly bought it to teach myself & to tinker on.

I can’t figure out the problem I’m having right now and it’s pretty aggravating b/c I’ve been tinkering since June and I’m ready to ride. I’ve replaced both front sheaves (the fixed sheave 2 times now), the clutch, the bell housing, mainly everything to do with the belt area I’ve replaced. Still having a slight problem.. When I put it into gear, it jumps and wants to die, but if I give it some gas it’ll go. MY ONE WAY BEARING IS IN THE CORRECT WAY. Once I put it into gear there’s no going back to neutral (unless I cut it back off). If you try, it’ll slam into reverse and cut off. Scared to drive it because I don’t want to mess any of my new parts up.

So I’m absolutely lost.. Idk if the highlifter clutch spring would have anything to do with it. Because once you get it into drive and running for a little while, when you slow down it won’t stop.. it wants to keep pushing the tires.

Any help would be awesome.. because like I said I’m 100% lost on what to do now.