Maintenance & Technical > KX500 Original

screaming kx500

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red:
i noticed my fuel line looked kinked and when i was loading the bike up it burst, fuel  every where. my main jet is 178,pilot58,stock needle in middle clip position.probably clogger fuel line,easy fix.

thanks good info.

Timbowe:
Phew easy fix.

Johnniespeed:
My 04 kx500 did a full throttle scream about 4 weeks ago, unfortunately it was raining and I had a bad get off, think I broke a rib. I noticed that the kill switch does not work during this full throttle thing. and that my throttle is not actually sticking. I have ridden it for many hours since and it has not occurred again. I have not checked it yet but I was thinking the float stuck open just once, anyone else had this happen?????

quincyman:

--- Quote from: Johnniespeed ---My 04 kx500 did a full throttle scream about 4 weeks ago, unfortunately it was raining and I had a bad get off, think I broke a rib. I noticed that the kill switch does not work during this full throttle thing. and that my throttle is not actually sticking. I have ridden it for many hours since and it has not occurred again. I have not checked it yet but I was thinking the float stuck open just once, anyone else had this happen?????
--- End quote ---


Yes, and it turned out to be the throttle cable. It was not bad but too tight down where it enters the carb. I zip tied it into position so it could pull toward the throttle with a slight bow for slack toward the carb. That fixed the problem. It's also a good idea to loosen your throttle hand control and make sure when you tighten it that you tighten it evenly. It can sometimes bind the cable when not torqued correctly. It's amazing how touchy these throttle cables can be. Don't forget to lube the cable.

KXcam22:
It is most likely a lean condition that is the culprit, either caused by fuel starvation or a borderline lean pilot jet.  When the mix gets that lean, the engine will run away and the kill button will not stop it since the cylinder mixture must be hot enough to self ignite (like detonation).  You can artificially create this by turning off your gas petcock while the bike is idleing (it's eery and scared the hell out of me - most bikes just stop, not take off).  I also had this happen once when riding, but I was trying a 55 pilot and riding at 0 degress C in 6" snow. Lots of dense cold air making the mix too lean then. With the 58 back in it doesn't happen. Hope this helps. Cam.

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