Maintenance & Technical > KX500 Original

Kick-backs for dicussion...

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paulkx5:
I experienced what I think is the same problem on my 90, when I let off the gas it would pop and there was a power surge, bad enough that the bike would buck pretty hard. In my case this was caused by a rich condition in the carb's idle/ slow circuit. I changed the slow jet from stock to a leaner jet, I can't remember exatly what size though, this completely cured my problem. Might be worth a try. Good luck.

kawdude:
I personally will try anything to make this condition go away.  It's annoying as hell.

paulkx5:
kawdude,
 I wish I could remember what  jet size I ended up with (been over a year), but I think it was a 52 or even a 50. I went through several progressively smaller jets, and the problem kept getting better, and it finally went away with just the jetting change.  Hope this helps.

kawdude:
That's ok.  Mine currently has a 162 main with a 62 pilot with the clip on the top notch so something definately isn't right.  I personally think that it's very rich.  Has no go past mid throttle and lots of splooge.

paulkx5:
Ialso had to drop my main jet several steps to get my plug reading correctly. This helped a lot with power and with the splooge.
As far as lacking power above mid throttle, have you checked your KIPS valves to make sure they are timed, and/ or not sticking?

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