That plastic limiting nut is loctited on from when the shop torqued spider back up. I rang some motorbike shops / polaris dealers today they are booked out for 1.5 months and not taking any jobs, was hoping to get it sorted so i can ride the dam thing! argh.
I explained all that had done with clutches and they seemed to think the problem was something to do with them. They also mentioned could be carb issue but it does 6500rpm, only other thing was the exhaust lobes. Noticed the belt has a bit of slack though. is it worth getting another one ? was planning to leave pvt cover off and put gopro looking at the belt so could see if its getting the full travel on the pulleys