for clutch setups, there are a bunch. some guys on here run heel clickers and some run heavy hitters and some run OEM weights, etc. some just add a 4.5g rivet to the stock flyweights, replacing the lighter 3.6g rivet, to cure the over-rev. they are all good setups that work better than stock. kinda depends on what you want to spend. seeing as the sled is for your nephew, i'm assuming you don't want to spend much. you'll be suprised how much better the sled will feel w/the ripsaw track alone. maybe for now, just add a 4.5 g rivet to the flyweight, leaving the rest alone, or try TURKS cheap trail setup, which is to put in a 53/43 helix and yamaha green secondary spring, leaving the rest alone.