airbox lid

[ZSK]

I know it's probably been posted a lot but i can't find the info I'm looking for. If I take off my air box lid will I need to rejet? If so how, can I do it without buying a new parts, and how much will I gain (power and speedwise) Thanks

[AtvMxRider]

Yes you have to rejet it cause you are aloowing more air in. You are going to have to buy new jets.

[Sick0]

You may. if you 400 is stock you take of the air box lid then you probly don't have to.