Maintenance & Technical > KX500 Original

#8 slide versus #7

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kxpegger:
I bought a KX500AF from Service Honda. The bike was slightly sluggish off idle and seemed to go flat a little early on the top end. Took the carb apart and found a 55 pilot, 175 main, CEJ needle and a #8 slide.

I left the pilot alone at 55 but replaced the main with a 170. I can't find a CEJ needle in any charts so I'm going to replace it with a N82M needle. My question is that the combination of jets and needles is recommended by Team Green for my altitude and temps but with a #7 slide. Will this work with a #8 slide instead of a #7. I don't have a #7 on hand. Is there a way to compensate until I can get a #7 slide?

Any help would be greatly appreciated!

KXcam22:
KXpegger,
  A #8???  I don't recall anyone running a #8 with any success. Hovever, it only really adds extra air at idle to 1/8 throttle so you might be able to tune it out.  I am surprised that it had a 55 and the #8. Hmm.  AJ should be able to tell you if this is a known good setup from them or maybe a mixup on the slide.  It is also possible that since the AF runs a different pipe (similar to CR500) than a normal KX500 that this jetting may be different.  Hope this helps. Cam.

kxpegger:
Every thing I've been able to find says a #8 is for 250cc not a 500cc. As you mentioned this may be something that Service Honda came up with because of the FMF pipe they use for the conversion. Maybe AJ will chime in?

Friar-Tuck:
 The CEJ is a  Keihin Needle ID.    The N82M is a OEM ID.
(Here's the conversion & needle legend)               http://www.sudco.com/vol33/135-136.pdf   

  I wouldn't be surprised if the bikes are jetted "Safe" for sea level and 70 deg. 
You might be able to find AJ's e-mail on the site and just drop him a note. He is a stand up guy and has responded promptly to other guys questions.
(I'll snoop around for the needle charts)
  Tuck\o/

kxpegger:
Thank you all for your responses.

I'm going to try and run it today with a 55/170/N82M and the #8 slide. If it runs goofy I'll bring the bike back home put a #7 slide on order and grab one of my other bikes to ride.

The problems I've been having are from idle to about 1/8th and I think the #8 slide is probably the main culprit. The motor is not crisp off idle and the bike surges quite a bit. I've had to turn the idle setting way up so the bike will start after it gets good and warmed up. Bike starts cold no problem.

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