New Cam - Rejet??

[tglandon]

I have an 03 400ex, I just put in a XR400 cam, but made no other changes... Will I have to rejet the carb???

[cals400ex]

more than likely not. if anything, 1 size up should be more than enough.

[wilkin250r]

Always re-jet. You can see a difference between a clean and dirty filter. Anytime you change anything in the engine, check your jetting. Most likely it will stay the same, but check it anyway.