Recently purchased a cherry dual-sport 99 WR400 with 320 miles. Came with Procircuit 304 pipe and exhaust...runs AWESOME but I need an exhaust with a spark arrestor. Willing to sell/trade exhaust or pipe/exhaust. email me at firstname.lastname@example.org thanks, Al PS Supposedly, Jimmy Button's mechanic "dialed in" the carb. All I know is this bike starts on one-half a kick! Anyone mechanically inclined (unlike myself) in the Sacramento CA area want to see what he did (to share with the group) I would be happy to hook up.