Maintenance & Technical > KX500 Original

carbs

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mun:
My old KX500B2 -86 have now VM44.
There is something where to start:
Jet Needle: 7DH2, 7DH3
Needle Jet: CC-0
Needle Valve: 3.5 (=3.5mm)
Fuel Tap: drill to 3.5mm.
Slide: to safety only brass, NO aluminium
Mainjet: 600-800 (2.1-2.3mm?)
Stock KX500B2 with stock VM40 MJ#380, but my KX need with VM40 MJ#520-540 and now with VM44 MJ#2.3mm+PowerJet#70.
Not sure, but I guess that stock KX with VM44 MJ#600 (about 2.1mm), but try rather little bigger first?

3Razors:
Bump for old thread.  A 44mm should give 3-4hp more on top-end.  I have a vm44 laying around and I'm interested in making it work on the KX5.  Thinking about installing one of Thunderproducts U.F.O on the throttle slide.  Claimed to give round bore carbs much better response, have read on other forums claiming that it does indeed work.

don46:

--- Quote from: 3Razors on December 25, 2007, 02:59:15 PM ---Bump for old thread.  A 44mm should give 3-4hp more on top-end.  I have a vm44 laying around and I'm interested in making it work on the KX5.  Thinking about installing one of Thunderproducts U.F.O on the throttle slide.  Claimed to give round bore carbs much better response, have read on other forums claiming that it does indeed work.

--- End quote ---

I don't think any one is running the VM style carbs anymore, at least for performance. Most are running the Lectron of the big Mikuni flatslide.

As for the UFO, I ran them on a snowmobile, can't say they gave it more power but I would say that it was more responsive, for the money it was a good investment.

3Razors:
What is the biggest mikuni flatslide they make?  From what I remember it's like a 41mm? I need bigger than that! I dont really want to mess with the lectron stuff as I have most experience and parts availability with Keihin and Mikuni.

don46:
I believe your right about the size of the mikuni flatside being 41mm, I would guess that it will flow better and more than the 44 round slide. Round slides are old school, the newer flatslides flow way better. As far as screwing with lectron, there really isn't much to them, they are quite easy to adjust, but hey, to each his own, whatever works.

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