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Yes, the HIT clutches are nice. Just not really cost effective unless you go BBK. We always run the factory clutch bells unless we can find one with cooling fins or one with a knurled inside. Most of the time the cooling fins either rub the engine case (dont fit right) or the fins come off the clutch bell because they were press fitted sloppy or the bonding agent melted! I used to do build sheets on all my scooters. They helped when you had to order parts down the road. I lost some of the "archived" ones when my garage got a roof leak. I had some good info on Helix parts, what fits what and such. I would find correct size aftermarket clutch springs that engage at a higher RPM. Sand the inside of the clutch bell were the shoes hit and see what happens. I would also track down a "tuning" roller weight kit, makes tuning much easier. Then when you find out what works best, order your permanent weights.
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