xr400r MegaMax II exhaust jetting

[bigbear08]

i just picked up a megamax II fmf with 10 disks for my xr400 and im wondering where i should start with the jetting. im around 900ft above sea level. when i installed the pipe, the initial bog got way worse. im sure i need the main and pilot jets, but should i go 2-3 sizes bigger on both? any help is appreciated.

EDIT: the main jet is a 162 and the pilot is a 62.

 

[bigbear08]

got some jets

i jumped up to a 170 main and a 65 pilot and moved the clip down one notch on the needle and its running pretty good! it has WAY more power with the fmf on there. i can do power wheelies in 3rd gear where it never wanted to before! :yeehaw: one of the best $100 ive spent! i'll get some pics up shortly.