Maintenance & Technical > KX500 Original

Only problem with my KX....

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Ramski:
Don't know about the fuel problem, but I did have my revs race up whenever in neutral or whenever I didn't have a load on the engine.  My problem turned out to be the throttle slide in the carb was not fully seating.  Easy fix.  Just the carb away from the air boot and unscrewed the throttle slide and re-seated it.

KXcam22:
GDubb,
  Sometimes half the fun of having a bike is working on it; learning to fix it (sometimes the hard way) making parts and tweaking it to make it better. I would suggest trying the jetting guides recommendations exactly on your next ride.  I've found them to be very close.  I had the same thing idle thing happen to me my last ride. I normally use a 58 pilot but leaned out to a 55 just to try it for the summer.  Was great but on my last ride in October in the snow, the 55 pilot was too lean to handle the increased air density at the colder temps(more air per fuel=leaner), so when the bike got hot the idle would run away. In that case I was just a touch on the lean side and the idle run-a-way would only show up when the engine was really hot. Ramski has a good point about the slide. When you open your throttle (engine off) and let is snap closed you should always hear a good strong "click" as the slide bottoms. No click means the throttle is not going to close fully. Cam.

mikesmith:
I just want to add that normally the float bowl is supposed to parallel the carb body,but I found setting mine higher than specs (19 or 20mm?Its been awhile) solved my blubbering in the rough,fuel going out the overflow lines when the bike was at the slightest angle and of course better gas milage!Could be your floats just stuck.

GDubb:
Thanks for the input guys! Just one more question regarding the jetting: On the jetting chart it states that he is running a V-force reed cage, I could be wrong, but dont you have to rejet when using V-force? What I'm getting at is that since I'm not running a V-force do I need to be 1 step leaner than what the chart says because of the stock reeds? Also, I have nothing to measure mm with so what would you recommend that I purchase as a good tool for setting my floats?

mikesmith:
3/4" is 19mm,use that and see how it works.The 500 is sensitive (at least Ive found to get the most out of it) to jetting.Temp,altitude,humidity effect jetting,so jetting is always changing some what.Take notes for referance as to what works at settings for the differnt seasons and riding areas (altitude) so itll be easier to jet in the future.Do one change at a time to keep track of how it effects the bike,the chart is just a starting point,not the Bible.Theres some good jetting post (how tos) here,so check them out and be patient.

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