Main Jet Part numbers

5 replies to this topic
  • drop

Posted April 14, 2007 - 09:39 AM


Does anyone know for sure what the part numbers are for the #178 and #180 main jets for the XR650R? I'm a little confused by similar numbers that I've been finding.

  • Bibleman

Posted April 14, 2007 - 02:30 PM


I just got back from the dealer and the parts guy said Honda does not even make jets as big as the 55/158 set-up I wanted. He's going to order them from somewhere else. It didn't sound right to me, but that's what I was told.

  • drop

Posted April 14, 2007 - 02:52 PM


I see that they have Keihin main jets in those sizes at the TT store. Does anyone know if those work with the stock carb?

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  • HawkGT

Posted April 14, 2007 - 03:09 PM


Yes. Any Keihin "hex" main jet will work--they're all the same, not carb/bike specific. Honda doesn't actually make the jets--Keihin does. Keihin main jets can be sourced from anywhere (inlcuding Honda). There's a vareity of Honda part numbers that will get you Keihin 357 Series (aka "Hex") main jets. 99101-357-xxx0 is one of them. Just replace the "xxx" with the size you're after.

If it looks like this and has a stylized "K" in front of the number, it's a genuine Keihin main jet.

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  • drop

Posted April 14, 2007 - 03:15 PM


Thanks HawkGT. I'll just order the Keihin main jets and forget about going through Honda then. I'll go to the dealer for the 68s and 70s pilot jets.

  • Bibleman

Posted April 14, 2007 - 04:53 PM


I just did a little research and if you go to you will find everything you need. They charge about 6 buck per jet.

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