[jetting a z400] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

Pages:1

jetting a z400
(Click here to view the original thread with full colors/images)

Posted by: scanz2k z400

does anyone know around what size jets to use? i realize it is probably trial by error, but i was just wondering if anyone might be in a similar situation. i have the following:

dyno jet kit (i bought it with this stuff on it)
kn filter and outerware
yoshimura exhaust
elevation is 1100

we can't tell if its the rev limiter or if it needs re-jetted. i bought it in a about a thousand foot lower elevation. i dont know how important that is, im kinda new at this sort of thing. i mean it runs good but we think we could get a little more out of it. it breaks up on the top end in around 2nd and 3rd gear if you really get on it.

Posted by: speakle

You opened the exhaust and intake now its running lean in the top end hence the cutting out. The jet kit will recommend what jets to use and how to set the need the mixture screw...start there then ask questions. If you dont understand this then bring it somehwere and let them do it because you will probably never get it working right.

Posted by: DVX440

Try a 160 or 170.. with the air box lid removed

Posted by: scanz2k z400

thanx guys

Posted by: wreckdiver

www.Z400Central.com has a couple awesome threads to guide you in jetting!!

Posted by: scanz2k z400

thanx man, i just got an email from my brother in iraq and he just told me about that site, so i'm gonna check it out.

Posted by: scanz85

How did ya make out, scanz??

Posted by: scanz2k z400

hahaha whats up scanz85. i made out pretty good. turns out that it was jetted just fine. it was hitting the rev limiter more quickly due to the exhaust. thanx for the concern. haha i'll tlak to ya later bro