151Viper
New member
I have a 02 viper with a 151x2" track 8t drivers and 20/40 gearing and when I took it to cooke city last year I clutched it per yamahas clutching chart for a short track and it would only pull about 8000 rpm while climbing.(8Ek weights and 13.3 inner) I would like to raise the rpms about 4-500 rpm if anyone has a suggestion on rivets? In general is there a formula for grams and the amount of rpm's change there are? The engine is basically all stock. Any help would be appreciated.