Maintenance & Technical > KX500 Original

Effects of Float height?

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Uzi9mm:
Anyone know how the float height will effect how the bike runs?   Will the float level have an effect on how the bike idles?

BDI:
The float height will cause it to be lean or fat across the board.The best thing you could do is set it correctly and leave it. Trust me playing with float height will cause you more headaches then anything. There are already enough variables to worry about with jetting with out throwing float height in the mix.

GDubb:
My float was out of adjustment when I bought my bike and when I pulled in the clutch the motor would race and I would have to feather the clutch to bring the rpms back down. I fixed it ASAP cause I could see the potential for disaster.


-G

Hillclimb#42:
My float height was wrong on the 250, when I bought it. It was set so that it hardly stopped the flow at all. It was new to me, so i had no idea about what it was doing to  performance. I did have a cold-foul deal, that i could bet on. Almost every start-up resulted in an eventual fouled plug, after trying to use the throttle just right trying to get warm. Too much gas=fouled. Not enough = fouled. Then with a new plug, started right up and rode the rest of the day. Finally let my buddy work on it and, he found the float adjustment to be way off. Bent the little tabs so that it shut off the valve right, and bammo, now I change plugs when I feel its been so long I can't remember when I put it in there. As for performance, I am not sure, I think it died on me less once fixed. Not sure though if that was the issue because I was throwing the book at it.(pipes, silencers and gearing) I think though, Bdi is right on with the set the float the way it supposed to be set, and tune with jetting. Actually the needle adjustment is pretty big factor to tweek on, but that is another topic altoghter.

Uzi9mm:
Thanks for the replies.  Just put on a Pro Circuit 2 pipe and 304 silencer.  Cleaned the carb with carb cleaner and checkt the floats.  When measuring from the mating surface for the bowl to the top of the floats (i guess its actually the bottom of the floats) with the carb upside down at an angle so as not to compress the spring pin on the float valve, its 16mm.  Does that sound right?  Am I doing it correctly.  Anyhow, my 5 Hundo doesn't want to idle.  I got the screw all the way in.  It idles for a couple seconds and dies.  Could a backfire damage the reeds?  Carb is set at 2 turns out, 3rd clip, 55 pilot, and 168 main.  I'm at about 5-600ft 95-100deg.  BR8ES at .024.

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