Maintenance & Technical > KX500 Original

92 kx500 problem

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sandblaster:

--- Quote from: shixanget on January 21, 2016, 05:39:10 PM ---but I believe a carb is a carb right?
--- End quote ---

In a word.... No  :-o

Read this, look at the pics then post questions  :-D
http://www.oem-cycle.com/forum/viewtopic.php?f=40&t=550

shixanget:
Okay I read it. So how could it go from riding fine one day and then the next just not even want to start? Will it being jetted wrong prevent it from starting or just running rough? I didn't remember to look at the number on the jets.

Foxx4Beaver:
one grain of sand/dirt in a carburetor can and will prevent a motor from running.
there's two jets inside...the main and the pilot. You should verify the choke is actually working too, and not sticking in one position.

It's possible the rubber tip on the valve float could be worn....or the needle seat could be worn...allowing more fuel than necessary in...which can also give quite similar symptoms as you're describing.
I would also remove the fuel tap, and be sure there's no sand/dirt clogging the filter that's attached to the tap inside the tank...and verify you have good fuel flow going into the carb.

Another simple thing you can try, that I don't think will help, but has at times in the past...is to disconnect the kill switch at the handlebars...just remove the one screw and let the kill switch hang off to the side when you try to start it. 

b4himdude:
check this out . i dint know everything youve done to it yet or what the symptoms are like exactly . but remove the rotor cover and verify that there is a good woodruff key on the shaft and the rotor is tight. ive had issues on the past with these 500's and their rotors snugging em down tight enough. if its just loose and key is still in good shape make sure you get that some bitch on tight tight tight,. i use rattle gun and then smack it with a rubber mallet and rattle it again. then if that doesnt do it locktite . just check its easily accessible and would be good to look at anyway. also if the stator plate came loose its could be the issue. easy fix you'll need a flywheel puller though.  under $20

shixanget:
Figured it out. Pulled old spark plug gap was at .045 got a new spark plug (ngk iridium) gapped at .024 started second kick! Runs better than ever! Thanks a lot guys! Still going to lurk around here so I can blow many on these cool parts I've been reading about.

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