Ride a bike set up for MX with and without a lightened flywheel, then tell me which is better. I would never go back to a stock flywheel, mine never stalls and I got power on the throttle when ever I push it. It's a whole different ballgame on the twin, if it were a single weight would be better. One of the best investments I've made on my bike right up there with the single carb and Gorr port.