Problem With 400ex...not Starting!!!!!

[red03400]

ok.... i cut down my yoshi exhaust 2 days ago and had problems starting it.....it finally jus started out of no were but now today it only cranks.... idk wat the problem is... theres a 146 main jet in there and it ran fine with it the other day..but now when it cranks for about 10 sec i take the spark plug out and its flooded everytime!!!!!..i checked to see if the float was stuck up but didnt find that....idk what would make it flood so fast ( and no im not holding the trottle when i start it).... and make it not start....its really pissing me offf.......i have no idea whats going on...any sugestions??? thanks

[ZSK]

A 146 sounds quite lean for the main. What is your other jetting? Pilot, needle and air mixture. Are you using the choke? Have you tried to pull start (bump start) It ran fine before the shorty? Do a quick spark check and install a new plug.

[RiderTRX400ex]

bump up your pilot jet, stock is 38, get a 42.. put it in see wat happens. should fix it unless there is another problem

[red03400]

Originally posted by ZSK
A 146 sounds quite lean for the main. What is your other jetting? Pilot, needle and air mixture. Are you using the choke? Have you tried to pull start (bump start) It ran fine before the shorty? Do a quick spark check and install a new plug.

yea the dyno jet kit told me to run a 146 w/ air box lid on and after market exhaust....my pilot jet is stock and the needles on the 3rd notch while the air/screw mixture is 3.5 turns.....i use the choke on and off....and no havnt tried to pop start it cuz i got no shoxs...still waitin on them...yea it ran fine before the shorty but ran fine 2 days ago with the shorty...i found a used plug i had that seems to b fine...so i put that in and im gettin the carb cleaned on friday so ill see how that all goes...

[red03400]

Originally posted by RiderTRX400ex
bump up your pilot jet, stock is 38, get a 42.. put it in see wat happens. should fix it unless there is another problem
yea ill go out and buy that tomaro or friday and see how it all goes w/ the clean carb new plug and new pilot

[Rico]

146 seems small with the lid on.

Definitly up the pilot to a 40 or 42

Leave the choke alone when you start it.

[red03400]

im at 970 ft above sea level...what size pilot would i need for that??

[Old Head]

At 970ft a 38 pilot which is stock will work but a 42 is better. also the stock main for that shoulda been a 148 but the main shouldn't affect the start up. i run a 170 main and i'm around sea lvl. have a full exhaust and no lid.

[red03400]

i took the bowl off the carb..and there was some (not much at all) dirt in the bowl part....so im cleaning the carb tomarro and buying a 142 pilot...im gunna put it all in tomarro and see how she goes....i hope it starts i just ordered my shocks ( last think i needed for my mx racer)....and now the thing wont start....what luck is that

[Old Head]

Its a 42 pilot not 142. probably just a typo, also take the jet with you there are 2 different ones for the 400 carb. I bought both when i did mine to save a trip since they were only 3 dollars each.

[red03400]

Originally posted by Old Head
Its a 42 pilot not 142. probably just a typo, also take the jet with you there are 2 different ones for the 400 carb. I bought both when i did mine to save a trip since they were only 3 dollars each.
yea typo lol....but thanks 4 tellin em to bring it..i woulda hadd to make 2 tripps!!!!!:mad: thanks alot old