f4istunna
11-25-2007, 06:25 PM
Sorry for another jetting question but im stumped on my gf's 400ex.
I think im on the right track as its getting better but still wont idle right all the time and puffs some smoke usually just when cold(going to do rebuild this winter which hopefully cures that)
Motor is stock, only thing ive done is the crf cam chain so far.
when i bought it for her it had alum open airbox, kn filter 155 main 38 pilot, aftermarket needle, fmf slipon (not sure which model) also looks like am rev box.
We do alot of creek crossings, muddy trails etc so i opted to put a stock airbox w/ lid on it and got a new uni foam filter. Also put a new fmf ti slipon on.
I left the 155 main in, put a 40 pilot jet in, and put a stock needle in w/ clip in the middle (3rd down i believe) fuel screw is 2 1/4 turns out. bike runs good everywhere but idle now. Im thinking its the fuel screw that needs adjusted a little more (i played w/ it but didnt seem to make much diff.) Just wanted to see what you guys thought.
It will sorta hiccup sometimes it stalls when it does this sometimes it doesnt. It does pop on decel but it also has a small exhaust leak at the slipon header joint so i think that may be whats causing that. the plug looks decent, its a little on the rich side (darker brown) but id much rather have it ruch than lean;) Seems to idle good other than the hiccup and occasion stall, has good throttle response.
Thanks for any help, ive been messing w/ this for a few weeks now, searching post, trial and error etc running out of pateince lol.
I think im on the right track as its getting better but still wont idle right all the time and puffs some smoke usually just when cold(going to do rebuild this winter which hopefully cures that)
Motor is stock, only thing ive done is the crf cam chain so far.
when i bought it for her it had alum open airbox, kn filter 155 main 38 pilot, aftermarket needle, fmf slipon (not sure which model) also looks like am rev box.
We do alot of creek crossings, muddy trails etc so i opted to put a stock airbox w/ lid on it and got a new uni foam filter. Also put a new fmf ti slipon on.
I left the 155 main in, put a 40 pilot jet in, and put a stock needle in w/ clip in the middle (3rd down i believe) fuel screw is 2 1/4 turns out. bike runs good everywhere but idle now. Im thinking its the fuel screw that needs adjusted a little more (i played w/ it but didnt seem to make much diff.) Just wanted to see what you guys thought.
It will sorta hiccup sometimes it stalls when it does this sometimes it doesnt. It does pop on decel but it also has a small exhaust leak at the slipon header joint so i think that may be whats causing that. the plug looks decent, its a little on the rich side (darker brown) but id much rather have it ruch than lean;) Seems to idle good other than the hiccup and occasion stall, has good throttle response.
Thanks for any help, ive been messing w/ this for a few weeks now, searching post, trial and error etc running out of pateince lol.