Cutting out like the rev limiter in reverse...but it is in forward.

Started out just while going up hill but then started all the time...

Any ideas? I have very little exp. with polaris and dont know all the safety circuits of this bike.

Is there somewhere get wiring diagrams?

 

It could be the ETC, Electronic Throttle Control. Make sure your throttle cable has between 1/16" and 1/8" freeplay. No less and no more. There should be an inline adjustment on the cable housing, under a rubber sleeve.