Maintenance & Technical > KX500 Original
Help With Revving High
blueoval:
Thanks everbody for the input. #7 slide. The throttle slams shut when the bike is off. It has a new throttle cable and the throttle tube and mechanism work perfectly (first thing I change when I bought the bike because it had a sticking throttle and it caused the PO to wreck and break his arm).
KXcam22:
Blue oval,
I think from your description that you might be confusing surging with a high idle. Surging happens to all K5s when they are jetted spot on. Your jetting and plug look good. Do a search for "surging" and see it the descriptions match what you are feeling in the bike. In cold weather with a lean pilot you can also get some lean idle runaway that goes away as soon as the outside temp warms up. I get that occasionally when I ride in snow. You could also try a 60 pilot and see what that does. Hope this helps. Cam.
blueoval:
Cam, I really think it is high idle because at low speeds and quick bursts of throttle it surges about 3-4 times. That was concerning at first and then I read the posts on surging, so I really feel that what I have is lean idle runaway. I am experiencing something different from the surging. It has been occasionally in the 30's when it was doing it the worse and when the temp got up to the 40's and 50's it was a little better. I will try a richer pilot as that is what seems to be the common suggestion by those on this site that have a lot more experience than I do. Thank you very much for the input - really appreciate all the help! ted
Polar-Bus:
--- Quote from: blueoval on December 29, 2009, 05:24:39 AM ---Cam, I really think it is high idle because at low speeds and quick bursts of throttle it surges about 3-4 times. That was concerning at first and then I read the posts on surging, so I really feel that what I have is lean idle runaway. I am experiencing something different from the surging. It has been occasionally in the 30's when it was doing it the worse and when the temp got up to the 40's and 50's it was a little better. I will try a richer pilot as that is what seems to be the common suggestion by those on this site that have a lot more experience than I do. Thank you very much for the input - really appreciate all the help! ted
--- End quote ---
People sometimes have a misconception that when your rpm's "hang" for a short period of times, it's attributed directly to your idle circut. This may not be the case IMO. I find that a ideal or slightly lean needle clip position AND a slightly rich pilot condition will cause idle hang. When you do a long, WO throttle run you have the true opprotunity to utilize all the residual mixture left in the crankcase, when you chop the throttle, and the engine comes to a quick idle, you are still technically drawing fuel from the needle, only after several seconds are you now truly drawing fuel from the pilot circut. So my thoughts are you are ideal in the needle range, but a tad rich (causing the engine to load up, and rpm's to drop over a period of time) within the pilot circut. I run a 55 pilot in my 500 for the warmer months. Keep in mind I am NO jetting guru, these are just my "rookie" observations when playing with my jetting...
One of the things i've learned over the years of jetting, is make SINGLE circut changes, and DOCUMENT your findings. This way you can more consistantly move in a positive direction when making changes.
blueoval:
Is it possible to fully check the function of the KIPS system without removing the cylinder head?
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