My question is I have 03 400ex with white bros. pipe, Uni air cleaner, no lid, and ready to re-jet i have purchased Dyno-jet kit, do i have to follow manual and remove front plastic and gas tank and remove the carb to do this or is there a simple way to do this, My dealer wants 150.00 to rejet, that seems a little high to me, I do have some mechanical skills,i would say above average, Any help would be appeciated,Thanks Guys!![img]i/expressions/face-icon-small-confused.gif[/img]

 

Im attepting the same thing and I have the same mods as you basicly and a 2003 400ex...i just finished rejetting tonite and it took me about 2 1/2 hours..its kinda hard if you never done it before.....as pushingthelimit says "you'll get frustrated and want to throw sh**"

 

If you are changing just the main jet you can loosen both clamps,twist the carb and remove the little center cap on the carb bowl. Inside that little hole is the main jet and it can be changed. If you are doing the pilot or needle you'll be better off pulling the carb out. That would be the plastic and gas tank,but not to bad of a job.

 

Thanks guys i figured the pilot and needle would be a stress tester, i am also wondering what spark plug to run DPR8Z OR DPR9Z ? WHICH RUNS COOLER? Thanks again!!

 

dpr9z is the colder plug. however, it may be to cold for your engine mods or the temp outside. its worth a shot though. i run them without any problems. sometimes they make the bike harder to start though.