Carb type and size on a '88 NX650

8 replies to this topic
  • SteveON

Posted January 29, 2008 - 08:40 PM


I am looking at getting a back-up carb for my '88 NX650 but can't seem to find the spec's showing what carb the bike came with. I found another carb off a '06 XR650L that I can get for a good price. Anyone know if they use the same carb?
Thanks in advance,

  • martinfan30

Posted January 29, 2008 - 09:18 PM


All I can find on the net, is that it LOOKS like the same carb. Ive seen some jet kits with the same part numbers too.

  • resurrection

Posted January 29, 2008 - 09:28 PM


Call Mid west action cycle in lake Geneva WI.ask for French and ask him to check some #'s He's great help Tell him Richard Gans sent ya.

I'm sure they're many Honda singles w/same carbs .
I'd bet as long as they are the same( I believe it's 43mm) they will work .Maybe some cable isues .

  • cleonard

Posted January 29, 2008 - 10:20 PM


Are they the same carb? I don't know. Will the XR650L carb work on the NX650? I'm sure that it will, but I can't say 100% that it is a simple drop in.

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  • Motosprtman

Posted January 30, 2008 - 07:54 AM


I would guesstimate it is the same carb, as the NX motor was used in the XR650L upon conception of the bike.

  • SteveON

Posted January 30, 2008 - 11:30 AM


It looks like the NX650 uses a 41 MM Keihin and the XR650L uses a 42.5 Keihin. I'm not sure if the physical size for the boots would be the same? The last thing I want is to have to scamble looking for intake (filter side) and exhaust (head side) boots to make the other carb work. I might be better off just to simply mod the existing carb. Just would hate to mess it up since it runs well now. I'd like a little more midrange power, smoother acceleration and of course cooler running temps. I am planning on Dave's Mod from Does anyone have an NX650 and performed that mod? If so is there any problems I should be aware of before starting? I already have the jets, drill bit and washer. BTW I am planning on running the stock 2 pipe system. I'm not a big fan of loud bikes.
Thanks for all your help. Thumpertalk is the best!!

  • martinfan30

Posted January 30, 2008 - 11:43 AM


If you wanted to run the 42.5 carb, just buy and intake manifold boot for an XR650L.

  • SteveON

Posted February 04, 2008 - 12:23 PM


Thanks for the info guys. I decided to skip the XR650L replacement carb. It would have been $175 shipped for a used carb. Still not a bad deal but for $250 I can get a new flatside for an XR600 at Xrsonly. For now I decided to try "Dave's Mod " on the stock carb. I've never removed the carb from a thumper like the NX. Is it that time consuming? Anything I should watch out for in the process?

  • martinfan30

Posted February 04, 2008 - 12:53 PM


Not sure about the Nx, but the L is very straight forward.

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