OzVMX Forum

Clubroom => Tech Talk => Topic started by: jake57 on June 23, 2013, 12:29:52 pm

Title: yz400e Jetting
Post by: jake57 on June 23, 2013, 12:29:52 pm

now i can start the f&^%$#@g thing i have a problem with the jetting.
it has standard jetting
38mm Mikuni
main 370
Needle jet Q-0
pilot 60
needle 6f-16
standard pipe
DG silencer
i had this problem before i changed electrics
once started it will idle , it will not rev , turn the fuel off when it starts to run out it revs ok
thanks jake

Title: Re: yz400e Jetting
Post by: motomaniac on June 23, 2013, 12:54:28 pm

check the float level.

Title: Re: yz400e Jetting
Post by: oldyzman on June 23, 2013, 01:23:04 pm

Yep like moto said, Check your float level, or check the needle for excessive wear...

Title: Re: yz400e Jetting
Post by: ARN on June 23, 2013, 02:59:59 pm

if float level is ok as it isn't running out of over flows ,they are miles to rich standard ,try 50 pilot I am running 45 and 3 plus slide (you can file yours) try that

Title: Re: yz400e Jetting
Post by: TT5 Matt on June 23, 2013, 03:33:08 pm

also check/replace the needle jet coz they DO wear out

Title: Re: yz400e Jetting
Post by: jake57 on June 23, 2013, 03:40:55 pm

thanks
new carbi , jets &needle
float level ok
3 slide
tried 45 pilot still the same

Title: Re: yz400e Jetting
Post by: firko on June 23, 2013, 03:56:53 pm

Don't tell me it's still giving you shit Jake? Has Phippsy had a look at it?

Title: Re: yz400e Jetting
Post by: TT5 Matt on June 23, 2013, 04:44:11 pm

ok the jetting you have stated is it std yz400e jetting or what came with a 38mm off the shelf carb?
know anyone with a good running 400d/e?maybe borrow their carb to see if it cleans up your carb problems then copy it if it works ;)

Title: Re: yz400e Jetting
Post by: jake57 on June 23, 2013, 05:07:42 pm

matt it is standard yz jetting
firko yes it is still playing up,no phippsy has not looked at it
 

Title: Re: yz400e Jetting
Post by: ARN on June 23, 2013, 06:17:59 pm

local bike shop had a yz250d which wouldn't rev out they rebuilt it and still had problem ,he lent a set of electrics of mine still no good ended up being a blocked exhaust or muffler.

Title: Re: yz400e Jetting
Post by: John Orchard on June 23, 2013, 07:56:14 pm

How old is the needle jet?  Had the same problem with my KX, it was a worn needle jet.

Title: Re: yz400e Jetting
Post by: motomaniac on June 23, 2013, 08:07:50 pm

if you have the old carb try that.the new carbs are different and you will need to play around with the jetting ie original jetting spec wont necessarily work in a new mikuni.

Title: Re: yz400e Jetting
Post by: jake57 on June 23, 2013, 09:17:12 pm

ARN  i will check pipe & muffler
John  needle jet is new
moto had same problem with old carby
thanks for your nelp so far.  have work commitments this week will try again on the weekend