Keihin NSR Jets in the USA

**Wed Mar 04, 2009 2:19 am » Post: #1 » Download Post**

Can anyone tell the the type of Keihin main and slow jets that are needed for a 1991 MC21 NSR250SE. I want to rejet the carbs and find that the places that sell Keihin jets sell several varations. Does KEIHIN
ROUND MAIN JETS N424-36 and 99101-393 sound familiar? These are 8mm in length and 6mm head diameter. What about KEIHIN SLOW JET N424-21? Any response will be appreciated. Thanks.

Skunkbait

**Wed Mar 04, 2009 12:46 pm » Post: #2 » Download Post**

Hello Skunkbait, and welcome to the forum.

Please read http://www.nsr-world.com/tuning/250-tuning/carburation%20index/carburettors/ and see if you still need to ask!
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Andy.
NSR-WORLD.COM

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**Wed Mar 04, 2009 1:08 pm » Post: #3 » Download Post**

Andy,

You have a great site here. Thanks for the tip. It did indeed answer the question on the main jet part numbers. It did not have info on the slow jets, though. I can always take mine out and measure them.

Thanks again for the help.

Skunkbait

**Wed Mar 04, 2009 1:32 pm » Post: #4 » Download Post**

SJ: 99103-MA4-0xx0
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

**Wed Mar 04, 2009 1:33 pm » Post: #5 » Download Post**

You da man!