Maintenance & Technical > KX500 Original

1985 KX500 fuel coming out of intake!!

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sevenbridgesangler:
Hey all, I'm new here I just picked up a 1985 KX 500 this last Saturday. I knew it needed a few things when I bought it, it was a little beat up. I bought it mainly to try and restore it a bit. Well here is my dilema it rode pretty much perfect Saturday bogging after 3/4 throttle. I said no biggy possibly needs a plug fresh gas clean carb etc... Well sunday I went to go riding and it started and would barley run. I had to hold the throttle a little to keep it running. It would die at idle and die over 1/4 throttle. I brought it home (my buddy pointed out Saturday head gasket was leaking slighlty.) I changed the plug to an extra one the guy gave me. It did the same thing, so mi read on the computer to check the floats they were probably stuck. I cleaned everything the floats were not stuck. I put it back together and same thing. So i did it again and same problem. Then someone pointed it could be because of the head gasket it got worse from riding and starting blowing all the compression back uo through the intake. because it was shooting fuel out the carb into the air box. any ideas what is happening??????

Sorry for the long post just trying to give as much detail as I can.

Purpletj:
two issues I see. Set the float height and also, I would recommend a new set of reeds. A good set will make a world of difference over the worn out ones.

Goat:
Check to make sure the rubber boot that bolts the reeds on and carb slides into isn't leaking air from dry rot cracks. Very common on the older bikes. If there are cracks you can silicone them or buy a new boot. Silicone is much cheaper but doesn't look the greatest. Check your coolant if it's dark (or smells like premix) it may also be the head gasket. If I think of any other possibilities I'll get back with ya. Hope this helps.

sevenbridgesangler:
How do I set the float height? I'll look into a new set of reeds soon. I just dropped the carb off yesterday at the local race shop to let them go over it. I should have it back today. I also ordered a head gasket for it I should have that today or tomorrow. Also with the reeds if they are worn how can I tell? cdan I just replace reeds or is there more to it? I don't know anything about 2-stroke gas engines. I'm a diesel guy  :-D

I'll take a look at that boot when I get home from work today. Thanks guys.

Friar-Tuck:
http://www.allthingsmoto.com/forums/f-15/how-set-your-motorcycle-carburetor-float-level-13609/

http://justkdx.dirtrider.net/floatlevel.html

 :-D

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