Maintenance & Technical > KX500 Original

need some help just bought kx 500

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Hillclimb#42:
Gas pouring out of the overflow means the floats are stuck. sometimes can be out of adjustment which affects performance, big time. Pouring waaay too much fuel in at idle would make it puke, till you finally got it wound out. Its just a little tab that closes off the pin. A visual inspection usually shows the cause. Sometimes a couple taps on it fix it, if you're lucky. I mentioned the overflows tubes, because if they get clogged then, when flooding because floats are stuck it wouldn't be able to get out. Thats bad. You can fill up bottom with liquid fuel and lock it up that way, in worse case scenario. If you see liquids pouring out, its usually worth checking out. Its not normal on a kx500. That sounds like that might be it!!!

300zgreg:
Hey Khaavet
I'm having the same problem!
I can't get the tire up in 2,3,4 gear and seems sluggish at low speeds.
A friend of mine has a 2004 crf250(stock) and he keeps up with me!!! That's Not right
Its a 92kx500 fmf pipe with 168 main and 60 pilot.
I did a compression test and its at 150psi.
I have been fouling plugs at low speeds in trails, its carbon fouled.
I'm looking to jet the carb not sure which way to go, i'm going to order reed spacers next week.

kx560:
Read spacers make it slower. Start by cleaning carb and air cleaner. Lean out the carb until its tan. Run bike at top end and shut off right away the check. At 2500 ft mine was at 162 and a 58 or maybe even a 55. Make sure the correct needle is installed and recheck those valves. Check compression with throttle wide open to let in air. Make sure that is even the correct carb should be a pwk 39 on a stock machine. It sounds like it ran good at first untill it warmed up. I had that problem once and noticed that better fuel made a big difference. Good luck.

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