has anyone ever seen a 400ex with a 500 bore kit ive heard of 440 460 465 and 480 but wat is a 500 like would tht hurt ur engine....... does it add lots of power also?
if i rejet with an open airbox will there be a bigger power difference than if i just rejeted for the white bros....... is there somethin special i need before i can open my airbox and leave it like tht or no??