When I talked to Trail Tech, they stated ...... The DRZ ATV has a 4lbs flywheel which they make a lighter 3lbs flywheel for sale. They state a very noticable difference in the speed of rpms ie: revs quicker, more pull. She could not tell me the weight of the DRZ kick flywheel or if the two bikes have the same flywheel. If they do, I will be buying one from them.
For those that don't know here is the some info from Trail Tech..
Removing weight decreases inertia, which increases throttle response - more snap! Sand sucks power away from a quad, increasing throttle response is a good thing. A balanced flywheel will reduce vibration..