ya
i have a slip on but not a full system so i dont think that is it and i only weigh 150. i have no idea why it hits it has only happen like 5 times and i have done like 300 wheelies on my bike. its kinda cool b/c when i do it at night it sends sparks out..haha but ya i always do stand up 2nd , 3rds, and 4ths i never clutch up just bouce the suspension.