Do I need to rejet ?

[fmf400ex]

I may be taking off my fmf megamaxII and putting on a white brothers e-series slip-on. Its jetted for the fmf, so could I leave the jetting the same?

[dj416]

i would try it and see, it might be ok, the only way to be sure is just check the plug

[Steve-o 400EX]

I agree, throw the pipe on and do the plug check, the jetting should be close but you may need to rejet if ur plug reads bad.

[fmf400ex]

ok thanks guys. so should I trade pipes? get the e-series?

[sweet300ex]

yes,trade!!!!!

[AtvMxRider]

What are you jetted at now?

[fmf400ex]

Well see I am not sure, when I got the quad it was already jetted for the fmf pipe. So I am not sure of what jet is in it.

[speedy400]

I'm fine w/ my mega max2, i just had to make a few adjustmants, i just got some stainless at the local shop, made a new end cap just drilled holes in it and (or) I made 1cm spacers for the baphles. trust me its not that hard, for got sake, I'm 15 and did it no problem, it helped a good amount and sounds real nice, pm me for anything else or pics

[fmf400ex]

Well I already took a white brothers end cap and put it on it. But last time I tested a whitebrothers on my quad it really woke the motor up, and I could tell a power difference changing from the megamax to the e-series.