white brother e -series main jet size

[WhiteBros400ex]

I have changed the jets alot from a 150 to 155 to 160 to165 to 170 , dyno jets and none worked out what sizes are you useing, if i dont find out i am prolyl going to sell the white brothers and get a hmf cause they tell you what jet size to use.But if you could help me out that would pretty nice thank you!!!!:) :) :)

[remlapr]

I'm using a 152 Klien, but probably need a 155 now that it's cold out. Seems like people have more problems with the Dynojets for some reason, especially with the Dynojet needle.

[WhiteBros400ex]

K is the 152 kelin or how ever you spell it can you buy that from your local shops.

[remlapr]

Yeah - Klein is stock, your dealer should have them for like 2 bucks each.

[cals400ex]

your bike should have ran with those jets in. where is the bike running bad at? if it is running fine at 3/4 to full throttle, it isn't your mainjet that is making it run bad. also, i don't think dynojets come with a 150 in the kit. yes, you can buy individual keihin jets at your dealership.

[Greg Z]

im using 155 on air filter and wb e series slip on seems a little lean since it does back fire / pops on deacceleration but only 1 - 3 times on a good 3 hour ride

[WhiteBros400ex]

Yea mine only back fire like 1 or twice in a long ride i just got the 416 though and i was just checkign so i wouldt mess up my motor

[cals400ex]

Originally posted by Greg Z
im using 155 on air filter and wb e series slip on seems a little lean since it does back fire / pops on deacceleration but only 1 - 3 times on a good 3 hour ride


i bet your using the stock pilot jet aren't you?? if not, you need to turn the fuel skrew out a bit. a little popping here and there may happen.

[Greg Z]

the guy i bought the EX from said he changed everything so i guess he chanegd the pilot jet, i was screwin around with the air fuel mixture It seemd to go down to like 1 back fire to none..

[WhiteBros400ex]

I am going to take my plug out tomorrow and if it is black idk what i am goign to i think i might try a 152 kelin and a 155 kelin cause i wanna get it running right, like it feels like its running right but dont run right when it is cold it back fire when its cold and runs fine when it gets warmed up with a pop everyonce in a while.

I need help with it lol idk what to do.

[cals400ex]

if the weather is getting cold, you may want to move your clip on your needle to the 4th position. also, the backfiring is probally from a stock pilot jet or too lean on the fuel skrew. is the bike runnning fine at full throttle?

[Greg Z]

runs fine at full throttle except that on deacceleration is sometimes a pop or backfire.

[hondarider2006]

any quad will pop a lil when decel. But if it pops a lot, try going with a 42 piolet, and 2 1/2-3 turns out on the mixture screw. Also do a plug test at WFO and if your plug is white, than your lean on your main jet, and need to go up a size or two.

[Greg Z]

oh yeah and when im reving it a lot like a 2 stroke wide open throttle full reved the quad like drops the rpm a bit and geos back up

is that hitting the rev limiter? this happens very little to cuz I never rev out the quad like a 2 stroke

[hondarider2006]

its probably your studder box your hitting. a 400 won't rev as high as a 2 stroke, but if your WFO in 5th gear, its pretty hard to give the rev limiter. If your jetted to rich, you will lose power at WFO.

[WhiteBros400ex]

thank you i am changing my main jet to a 155 for winter and a 152 for the summer.

[WhiteBros400ex]

I put a 152 in it and now it wont start do i have to like adjust the fuel to air screw or anything like that.

[mustang93]

I live in Connecticut (very close to you) I am running a 42 pilot 1&1/2 turns out on the mixture screw Dyno Jet kit 170 Main needle jet on position #3 with the E series S bend slip-on K&N air filter no choke and air box lid removed. I have no problems starting even at 0 temps I just pump the throtle 10 times and let her rip... hope this helps you out the problems your having dont make sence :confused: do you pump the throttle before firing it up?

[WhiteBros400ex]

I put a new spark plug in it and it fired up nice and ran good i am going to do a plug check but it has a 152 in it and was runnign good for the 2 minutes i ran it. Ill let you know after i check the plug.