OK for racing!
The recently released HiT ("Hi-Thrust") clutch from Dr. Pulley is an absolute revolution in clutch design. In testing this clutch consistently increases road speed, torque and power transmitted to the rear wheel and reduces heating and wear of the shoes and clutch bell.
Size: 107, suit 107mm inside diameter clutch bells (some Honda, Yamaha, Suzuki, and other Taiwanese and Chinese)
Note this clutch engages very positively, and depending on your setup and desired outcome you will need to adjust the meet point and engage points (RPM) using the supplied springs and in some cases changing of roller weights.
This works by mechanically forcing the shoes against the clutch bell once it engages instead of only relying on centrifugal forces. The reduced or eliminated slip transmits so much more of your engine's power that the increase in performance is instantly noticeable. Recommended for tuned engines or demanding riders, and requires a bit of reading of the instructions and sometimes, some time to set up is required.