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 Topic: Spare keihin carb jets.. 







Andy
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Andy » Thu Apr 30, 2026 3:33 pm

You should be able to order direct from a Honda dealer in Italy. The part number follows this pattern: 99101-383-xxx0 where xxx is the jet size. E.g. 99101-393-1280 is a (standard) MC21 128 main jet.

Sizes follow this pattern: 125 - 128 - 130 - 132 - 135 - 138 - 140 - 142 etc. etc.

The only difference is when you get up into the 200s, which you never will! Wink

I would NEVER advocate using Chinese/unknown brand jets, and have even seen "unusual" results using DynoJet mains, as they are not the same shape internally as Keihin.

CMSNL so far have shown any random number I plug in as available.

Info also stated in the opening section of the carb tuning page on the Main Site. Wink
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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.


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