Maintenance & Technical > KX500 Original

1984 KX 500 Jetting recomendations

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electech:
My buddy and I are trying to tune a 84' 500, we keep fouling plugs and it seems really rich on bottom.  It has a fresh top and bottom end and new reeds. The carb is set to spec and runs great as long as you keep it cleaned out. Anyone with experience on this old of a machine please help. We are at 200ft here in East Texas. :cry:

sintax:
what are your current specs?

give this chart a shot, it will get you close.

http://www.kxriders.com/forums/index.php?page=11

electech:
The chart does not speacify what carb they are for.  If the chart is for the Keihen PWK it wont help me a bit. My carb is the mikuni vm38ss.  Pilot-40, Clip-2, Main-172, Screw-1.5 turns. 200ft, 65 degrees.

YUNGGUNNAZ:
was this motor pressured tested for leaks?how much break in time on it and how was it done?are reeds in good shape and closed?doesn't this one have copper head gasket?how was that sealed?what pipe?answer these first and you'll probably get better responses.jmo.

electech:
Motor was pressure tested, 5 hours break in and broke in similar to forum recomendations, reeds are brand new, cant remember what head gasket was used, pipe is stock and sealed.  Bike ran the same before rebuild. With fresh plugs will start first kick cold with choke and clean up and run.  After it gets warm low speed trail and or short idiling will cause it to load up severly and will usually clean out and run. Other times will bog, back fire and die and its over. Plugs  BR9 NGK, if there is anything I left out that might help let me know.

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