OzVMX Forum

Clubroom => Tech Talk => Topic started by: evo550 on January 22, 2013, 11:51:51 pm

Title: Keihin pwk needle codes ???
Post by: evo550 on January 22, 2013, 11:51:51 pm

I'm trying to decipher some keihin needle codes  ??? ???
Anyone know which is the leanest out of this bunch: N2ZW, N2ZJ, N2ZK, N2ZL.
Anyone know how to read the codes?

Title: Re: Keihin pwk needle codes ???
Post by: Tim754 on January 23, 2013, 11:15:05 pm

http://www.duncanracing.com/TechCenter/KeihinCarbJetting.pdf
Try the link above for ten pages of info Evo

Title: Re: Keihin pwk needle codes ???
Post by: evo550 on January 24, 2013, 12:22:53 am

Thanks Tim,
Good easy to understand explination, and it seems I'm on the right track.
The codes must be KTM specific (for a new 300  :) ) Unfortunately the manual doesn't advise on how to determine which needle is richer and what is leaner.

Title: Re: Keihin pwk needle codes ???
Post by: JohnnyO on January 24, 2013, 10:26:39 am

With a KTM the needles get leaner as you get further down the alphabet.
A= rich  Z= lean

Title: Re: Keihin pwk needle codes ???
Post by: evo550 on January 24, 2013, 10:38:48 am

Any idea what the number and the second letter are, as the spares kit also has a N8RW, N3RJ and N3RK...I think, (I'm at work right now.)
I ended up getting the verniers out last night and measuring them all at 3 identical points to find the thickest, which I think would be the leanest, and dropped that in. That has cleaned it up somewhat but stll blubbery at about 1/2 to 3/4 throttle, set on middle clip.

Title: Re: Keihin pwk needle codes ???
Post by: Honda Hoarder on January 31, 2013, 08:45:40 pm

Goggle Show and go bikes in SA or WA call them they will tell you. They are the Australian dealer for PWK and Kehin