More flywheel weight gives better tractability at low throttle settings, like tight woods or climbing loose, rocky terrain where wheelspin in not wanted. You may get a little better launch(lunch) off the start, but it will take longer for the motor to get to the meat of the powerband. I assume you're racing the hill at the dunes, right? I had one on one of my CR500's and while it was good in technical desert settings, I took it off for the dunes. You need to get up on top of the sand as quickly as possible.