hey wuts up i just got a white brother e i was wondering wut i should do jetting wise???? its the slip on.

 

thats a 400ex 02

 

didnt it come with jetting recommendations? Melinda Rae

 

id say a 155 main would be good

 

no i got it off my friend and his mom bought it for him and never gave it to him and he sold his quad and never even got to put it on and it wont fit the new one!! so he sold it to me but didnt have any info

 

my b/f's has a Eseries on a Z400, and it came with a 165 main jet, but you have to remove the air box lid...

 

If this information is correct then go with a 160 or 162 to keep your lid on.

 

 

do not use a 155, that is too rich, i used a 155 main on my 400ex with a k&n and it was still too rich even with more air, the main jet just lets gas in when its full throttle so changing the other jets would be more important, i have a 148(stock) in mine now and it runs perfect on top end, but the jets controlling idle and mid engine are changed, opening up the pilot jet and air/fuel mixture screw would help u out, it took me 3 months to figure out what was best, jets are tricky, GOOD LUCK

 

well when i had a 400ex it had a pro circuit silencer with a filter,rev box and a 152 jet. ran perfect