Tonight went riding, 20 degree temps, fresh 2 inches of snow ontop of a loose base to start, not ideal speed conditions. But with stock primary springs, 8dn-20 weights with 4.5 each hole, 52-46 helix and green spring at 70, rpms were 8600 from any speed, and held 8600 on the nose. Pulled hard, lots of track spin with the conditions though. 96 mph on gps. Clutches were cool. Marker line on primary was 1/4 from top, or slightly closer, so that's good. Secondary marker line was 1/8 from bottom of secondary. Not sure if it can even wear off any farther down... I need better snow conditions where I can run on hardpack to get a good speed reading. Idk of any sleds 121 with 1 inch track could break 100 mph stock with these conditions. What's your thoughts? Belt seems to be shifting out all the way. I think this is as good as I can get. Even with other clutching set ups, when belts at top of primary and bottom
Of secondary at 8500-8600 rpm, speeds would be same with any set up when belts riding like that. Am I correct?