Maintenance & Technical > KX500 Original

Jetting for 500 ft NY

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reknelb:
I know there are a few guys on the board from my area (wny), was wondering what they, or anyone else around 500 ft above sea are running for jetting. I would say most of my riding is from 50-75 degrees F. I pulled my carb and reeds off today and noticed my intake boot has a ton of cracks and it looked moist like maybe it was seeping. I'm going to get a new one to be safe and maybe try messin around with my jetting. My current jetting is:
175 main
60 pilot
n82m needle 2nd clip from top
float height was at 16mm

The jetting chart for my altitude and temp are a bit different
168 main
58 pilot
3rd clip

Doesnt say which needle. I noticed some people are running different needles. I have a fmf pipe and silencer, and I believe dual stage reeds. Think I should mess with the jetting?

KXcam22:
reknelb,
  My carb boot was always weeping around the carb mouth until I tossed the stock clamps and went to some regular narrow hose clamps.  I have found that the jetting chart is very close.  I would suggest that those chart settings would be a good place to start. The 175 main sounds like a desert racer.  The 60 pilot is rich for almost anyone.  For most cases the stock needle is OK.  I think you might be supprised at how much better your bike will feel.  At your altitude and temp, if anything err on the richer side.  I run 165M 58P N82M (all the way down) needle at 1000' but much higher temps than you. Hope this helps. Cam.

reknelb:
Ohh yeh, I run 50:1 mobil mxt2. Not sure if that matters.

Cam,
My intake boot is so bad that I'm going to buy a new one just for piece of mind. I see what you mean about using a narrow hose clamp though. Thats probly where the seepage was coming from.

KXcam22:
reknelb,
  The narrow front clamp was $1 from Lordco.  I used a normal width for the rear since they didn't have the narrow in that size. It just barely fits.  The rear clamp from a KTM 300EXC fits perfect but is more money. Cam

reknelb:
Did a closer inspection of the boot today, found a hole right through where the gas was seeping. Glad I didnt run it very much, coulda been a disaster. :oops:  I'm off to the dealer to order a new boot and grab some jets.

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