Maintenance & Technical > KX500 Original
throttle adjustment vs idle adjustment
Uzi9mm:
#1
--- Quote from: 95formula847 on August 11, 2009, 10:36:49 AM ---i was tinkering with my carb today trying to get my bike to idle. i took a look at the throttle cable where it meets the grip. Theres an adjustment there with a lock nut. Mine is all the way in... could this cause it not to idle? I was gonna just test run it but its started pourin down rain. so sry if its a no brainer question.
--- End quote ---
I had the same problem that went through a couple stages trying to fix. I had the idle screw all the way in etc.... First thing I did was post my prob on here. Everyone said to clean the carb and check jetting. I read about guys using a longer bolt to get the K5 to idle but I wanted to fix the problem. When I got my bike the previous owner was using ALOT of Belrays Air Filter oil. There was a bunch of oil in the carb and boot. I cleaned the carb, and checked the jets. My bike came with a 55 pilot, 168 main and 3rd needle clip. So, I tried a couple different pilot jets. I went down to a 48 just to get a little idle. The bike would idle for a minute but die if you didn't rev it. And, I was worried that a 48 was too lean. Everytime I pulled off the carb i would find oil in it. Again and again I sprayed out the carb and all the passages with carb cleaner. So I trashed my old filter and the Bel Rays filter oil. I bought a new UNI and a oil/cleaning kit. The oil is light and the cleaner works great. I use 100LL and Bel Rays H1R @ 32:1. After the filter deal the bike idled better and longer before it would die. Not fixed yet tho. I was still finding oil in the boot. And my bike still didn't want to idle. Go to next post.
Uzi9mm:
#2
--- Quote from: 95formula847 on August 11, 2009, 10:36:49 AM ---i was tinkering with my carb today trying to get my bike to idle. i took a look at the throttle cable where it meets the grip. Theres an adjustment there with a lock nut. Mine is all the way in... could this cause it not to idle? I was gonna just test run it but its started pourin down rain. so sry if its a no brainer question.
--- End quote ---
The guys here recommended that I check the float level. I turned the carb upside down and the seam was parallel with the carb body and the valve spring decompressed. Finally, I replaced the floats and float valve. I took the bike for a ride and checked the boot. No oil this time. I'm no mechanic but here's my best guess. I think either my floats were a little heavy or the float valve was leaking a little. Allowing the bowl to fill up too much. I think that gas was getting sucked into the carb throat and running back into the boot when I was riding. The gas would evaporate leaving the oil behind. Then the oil was getting into the carb passages. Once in a while i would get some overflow but just a little. After a tank of gas my bike started to idle so fast that I had to turn it down. I also returned to a 55 pilot. My bike idles fine now. Good luck.
95formula847:
now that i put a new topend on the bike it idles fine. im thinking the idle issue was from having 75 psi compressions
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