Maintenance & Technical > KX500 Original

Only problem with my KX....

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GDubb:
The only problem I had with my new KX5 was this.... When I pull in the clutch, or click it into neutral, or even sometimes when the rear wheel leaves the ground, the RPMs race.  I either have to use the clutch as an engine brake when I'm sitting still or use the rear brake to slow it down when I'm slowing but still in gear and moving. I read in other posts that this can be caused by air leaks,  but before I checked into all that, I was wondering if my floats could have something to do with that because as I was having a friend that went riding with me listen to it to try and troubleshoot the problem, he noticed that I was steadily leaking fuel from my vent hose. So could this be the problem? He seems to think that it may be the cause. I plan to pull the carb tomorrow after work and see what I can find but wanted to see what you all had to say first. I'm hoping that this could be the problem as it sure seems that this would be much easier to remedy than tracing down an air leak.  Also... does anyone know a standard measurement for the float levels? I know its 16mm or something but have no way to measure mm.

hughes:
I have nevered noticed fuel leaking from my vent lines. But you are on the right track with the floats. You may have one hunging up or the needle/seat is worn. Extra fuel with no load on the engine could make it rev. up. Check out the carb.

KXcam22:
Gdubb,
  Search in the jetting section. I posted easy instructions for setting the float level without measuring.  Also, check the carb mounts for leakage. My carb clamps were not round so I replaced them with a narrow hose clamp from an autoparts store.  A narrow hose clamp from a 2002 KTM EXC will do for the rear.  A too lean pilot jet will also cause that, more noticable when the engine is hot. Good luck. Cam.

reknelb:
Fuel coming out of the overflow hose is usually from a worn needle valve. If your bike is brand new and leaking, it could be that the float height is way too low. The float bowl could be filling up and never actuating the needle valve if the height is wrong. If the height was to high, then the floats would actuate the needle valve too early and starve the engine of fuel on wide open bursts, but there usually isn't fuel coming out of the overflow in that situation. float height is supposed to be 15-17mm

GDubb:
Cam,
  I searched forever and finally found your float level post, i'll tear into it after work today. As far as the pilot jet... I hate to admit this... but I dont even know where that is! The only jet I've ever had to mess with on any bike is the main. Ive never even had to mess with my needle other than to make sure it was in the position the bike shop told me that it should be, and coincidently, it has always been in the right spot.  The only thing I know is that the bike had a 165 main when I got it, I bought a jet 2 sizes richer for the dunes which I believe is sea level, and the needle is clipped on the second from the bottom. Anyways, I'll pull the carb and check the float level and the needle valve and start there. While I'm in there I'll see about locating the pilot and see what size it is and reference it with the jetting chart. Thanks for the help!

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