Where is the restrictor on a quadzilla quad bike?

not checked on mine as yet but for the 2-stroke it will either be in the exhaust (were it bolts too the head) be a small ring/reducer that's spot welded in. or there will be a reducer in the carb.

hope this helps.

you can fit uprated exhuasts and bigger carbs for a bit more power.

or

change the sprokets to alter top end or accleration.