I have just purchased a 2021 xrs 900 turbo, installed a tune, dalton adjustable clutch arms, stock primary spring, dalton byr torsion spring with stock helix. I didn't change the gearing as I wanted to try stock first. I mainly ride corner to corner trails and few friendly 500ft drags. Rarely due we top end on ice or fields so top speed is low on priority list. In short drags in grass the sled launches hard then hits a wall around 400ft. I was wondering if anyone has tried say a 47/42 or 47/44 helix instead of regearing. Surely don't want to create belt heat on the clutches, they run quite cool, but after launch you can feel when the clutch is transitioning to the 40 degree part of the helix and shift slows right down. Seems on the 800's I used to have 42 and 44 were very common helix numbers that worked good. Please stay on topic with info you've tried, not what you dreamt about or read on a cereal box.