It's the same engine and clutching system as the Grizzly. The only difference is heavier flyweights for the Kodiak. You can install anything meant for the Grizz into the Kodiak. Grizz 18 gram weights would be more than adequate for those tires. If you don't want the aggressive shift pattern that those weights produce you could shim the primary or have the sheave re-cut. If you want a full "kit" EPI makes a reputable kit. Call them and just tell them what you have for a bike. They should set you right up.