Keihin PWK Needle Chart

[MattR]

A fellow member (jhendr3702) sent this needle chart to me. It provides a nice description of the needle codes for Keihin PWK carbs. I'm creating a "sticky" for future reference.

CLICK ON THE THUMBNAIL BELOW TO ENLARGE:

[mrkartoom]

Much better than the poor images from elsewhere. Thanks

[HRRacing]

I purchased a used 2003 EC250 and with it is an envolope full of jets and needles. After searching the web I have not found any clear information regarding the needles I now posses. They are as follows: N1EC, N1EG, N1EE, and NBHK. Can anyone help me as to what needles these are? Thanks

[Jim Cook]

Originally Posted by HRRacing

I purchased a used 2003 EC250 and with it is an envolope full of jets and needles. After searching the web I have not found any clear information regarding the needles I now posses. They are as follows: N1EC, N1EG, N1EE, and NBHK. Can anyone help me as to what needles these are? Thanks

Just in case you haven't found your answer, yet, I thought I'd reply.
the jet needles that GasGas put in the Keihin carbs were the "N1E" series.
The N1EC, N1ED, N1EE, and N1EF (progressively leaner as you go down the alphabet) were what came in the older models. Around 2005, we started seeing the N1EG jet needles.

In this series, I prefer the N1EG. When we started using that needle, we were finally able to get our bikes to idle without bottoming out the throttle stop screw. In my 2006 DE300, I ran it with the "Jesus clip" in the second groove from the top. (along with a 42 pilot and a 175 or 178 main, according to the temps outside).

I don't have a chart, so I'm not sure of the NBHK.

Matt,
Thanks again for posting the chart. It sure has come in handy.

Good Riding!
Jim

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[m nipper]

Hey I noticed this post and was hoping you could help me I have a gas gas ec300 09 I am trying to get It to run a bit ritcher and have limited knowledge on how to jet my carb it is a kehnin pwk 38 mm the previous owner told me he had changed the needle on inspection I found a needle stamped chn I also got the other needle which is a n1ef I contacted gas gas and they told me the stock needle is a n1eg I am lost as to what to do next I haven't checked my main jet yet I thought I could just lift my needle 1 clip position but it was already at the top I only suspect it is running lean because my exhaust has no oily residue at all and has a slightly brown tinge not grey the spark plug dosent look to bad just chacole black I would apriceate any advice

[barossi73]

list what elevation range u ride,your avg temp range,what fuel octane/oil ratio u use,clip position and what jets u have now,(slide # if able) and someone will have a good starting suggestion.alternatively trawl thru the jetting database for similar bike operating in similar conditions to get an idea.how does it feel riding it?any starting/idle issues?bogging when you crack open quickly?the n1eg is I think 1 step leaner in diameter than n1ef(assuming your main is stock?)dont know about the chn.when you say the needle is at the top(highest/richest position)you mean the clip is in the lowest slot right?clip in top slot is leanest,lowest needle position.just wondering as the needle in it(n1ef)is richer than stock(n1eg),and would be surprising if it needed the richest clip slot also

[memphis2857]

The float level adjustment is what Jakobi is referring too. Look at the top of your carburetor and tell us what it looks like. Also need to determine if it is a 36 or 38 mm. Should be stamped on the carb body somewhere


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[PFD023]

Trying to order a NE1G needle for my AS1 carb. Going to the Keihin order sheet and I have no idea what the corresponding code is for that needle....anyone have an idea?

[Zrt1200]

This is what I go to when it comes time for Jetting.

http://www.jetsrus.com/a_jets_by_car...n_N427-48.html

And

http://www.kyajet.de/

[Jim Cook]

Originally Posted by PFD023

Trying to order a NE1G needle for my AS1 carb. Going to the Keihin order sheet and I have no idea what the corresponding code is for that needle....anyone have an idea?

For the AS1, I preferred the N1EG; however several of my customers preferred the Keihin DDK (or close) jet needles.

I always got my N1EG needles for the AS1 carbs through GasGas parts, but it is a 1998 Kawasaki KX250 series jet needle.
Part #16009-1764 (NEEDLE-JET,N1EG) parts diagram reference #16009F
1998 was the last year for which I saw the needle listed.

I checked two parts suppliers, Bike Bandit and Rocky Mountain ATV, but neither of them show the jet needle as being available.
A Kawasaki dealer may be able to help you.

Good luck and good Riding to you!
Jim


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