This listing is for a new Keihin 28mm PWK Style carburetor which includes the proper jets for running an aftermarket exhaust with open air box lid, if you have other mods or need additional jets other than what is supplied message me. The fitment of this carburetor will require you to heat up the intake boot, and modify the air box side. Also the carburetor bowl may hit the clutch arm so it’s suggested to use a reed spacer or slightly tilt the carburetor.