HELP, i dunno what to do

[Martin Blair]

Ok i went to little sahara and when we first arive there and before that up here in kansas jetting was fine for the first couple days, then i raced my bike at the drags and raced probably 50 times, no the damn thing backfires all the fing time, eveytime i let my thumb off the thortle it backfires, it does it with the same jetting as before when it didnt backfire it does now, i removed my chocke when we got back and have tryed leaning it way out with my k and n and pipe i went bakc to stock jetting and it still backfires, what the hell is wrong with my damn bike? should i try richening it, we did vavlve clearence when we got bakc from little sahara, so it cant be that unless there somethign im missing i dunno wtf to do :(

btw im running the stock needle at clip 3, a dj 155 main, and a kehien 40 pilot jet with air screw 1 1/2 turns out

and the dj jets the same size as kehine? (sp)

[Martin Blair]

bump any info?

[QuadTrix6]

u tried to lean it out when it backfired :confused:

you need to richen up the pilot. try a 42 or bigger.

[Martin Blair]

when it backfires is it runing to lean or to rich? i dont remeber i thought it was to rich

[Texan32]

backfire=lean
bog=rich

[Martin Blair]

ok well i had a 45 pilot in there originally and it was backfiring the lrd specs is a 50 so i will try a 50 and leve the need at 3rd position and main at 60

[Bad Habit]

I agree with Texan. I read in your earlier post you are running a 155 main. Do you have the airbox lid off? I was running a 170 main with my lid off.

BTW, the wifes 250EX with K&N, no lid and Yoshi pipe would pop like a sumbich when you let off. I went up to a 110 main from a 105 and it was fine.

[Martin Blair]

i went up to a 160 main i believe i did so much jettign today i dont remeber, lol i will check tommrow i will put it at 160 if its not and run a 50 pilot, yeah it pops alot on the decel my dad says that becauses its rich, i thought it was lean but me and him argued so we mad it leaner today and it didnt do ****, guess i was right.

also a note it doesnt ahve a spark arrestor but it didnt backfire before without it, im getitng one soon thought it shouldn't affect jetting should it?