Maintenance & Technical > KX250 / KX125

My bike is a pig. It eats gas and spark plugs.

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mikesmith:

--- Quote from: mxrider503 ---good advice john but doesn't really help me other then i can tell you guys that it is a dry carbon buildup possibly from a cold running plug. Any suggestions for a more appropriate plug?
--- End quote ---
Sorry I just noticed that its a "dry carbon build up",but I would still try my above post being its eating gas and Id need to see the plug as far as the fouling.Hope I was some help.

mxrider503:
whew! lotta stuff to consider.  Just to be sure as somebody said differently my air screw is the brass one next to the intake and the idle is the black plastic one kind of positioned at the bottom of the slide.  Also just to let you know i had a problem with the float before and i took it apart and and adusted the "tang" I believe its called. It stopped leaking gas through the over flows when it was off and or idling. However would adjusting it too far also cause it to leak gas? or perhaps could that be the issue with the plug.  Because I've noticed with that adjustment to the airscrew I said before, has definitley helped my bike performance.  Also just to let you know what happened on saturday when I was riding. I hit the gas hard as I let the clutch out hoping to rooster tail the hell out of my buddy and his Xpar 200 but to my dismay the bike just died. Then the second plug was replaced when I was just sitting waiting for my buddy to catch up with the clutch pulled in and I was in first gear and it just died. Sure enough a new plug solved the problem and I started my bike up yesterday and it ran better then it did on saturday. Insanley touchy and I couldn't keep my front wheel down! Ill try another tinker session later this week. As far as the plug goes I'll see if I can get some pics up here as I have never posted pics in a forum.  I am definitley curious about that float so please get back to me :)
Thanks,
-brian

mxrider503:
also what is the typical gas mileage of a kx250? i have one of those larger img gas tanks and it goes through half a tank about 1.5 gallons in about an hour of not even consistent riding.

mxrider503:
also is the float supposed to allow dripping while the bike is running?
-brian

hughes:
You may be finding your problem. Their should be no fuel dripping from the vent lines with or without the engine running. You could have a worn needle or seat or just incorrect float level.

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