Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
kawdude:
Right now I have mine sitting at the bottom notch. It's very rich mid and up. I'm going to move it back to the 2nd or 3rd notch to lean it out. I may try going down on the slow jet because the screw still doesn't do much to change the idle.
gowen:
Kawdude, if you mean the bottom notch being the 5th notch, that would VERY much effect the idle and top-end performance. I'd drop it to the 2nd notch right away and see the performance change, I promise it will help ALOT. That was my problem was the needle, once I got the needle to the 1ST notch it helped me realize where the circut was off, and I was able to lean out the pilot and main slowly, once I got down in the pilot, I was able to move the needle down one (richer 2nd notch) and that has helped alot. I'm just about right in the mid section and top, a little rich on the top when in humidity/rain. I'd adjust the needle and give it a try. Let me know.
EDIT: I forgot to mention that when I sent the needle to the 1st notch the idle instantly arose. Though, I could tell the low was rich cause of a uneven rev and rough idleing. So, I moved the pilot down until the mid range became too lean, I could tlel cause of surging and a over sensative throttle. That is when I moved to the 2nd notch, did wonders for the power. Just a thought.
kawdude:
I totally agree. The bottom notch is way to rich and I feel the bike acting as such. I had the clip in numerous slots just to find out how it effects everything. What I've noticed is if the clip is in the 2nd position from the top the bike surges badly. However, it does idle. My next attempt would be to lower the slowjet. I believe I'm at a 52, maybe 55. Either way I drop to the next. With what you've said above are you implying the mainjet has been dialed in?
gowen:
Yes, I have power right off the idle, it jumps right into the high rpms, unless I'm on pavement or something. But, if I recall, you are a bit above sea level, so it may not be the same. Who knows.. If you need some jets, I've got them all. :-) Pilot and mains.
kawdude:
Here's the lastest in the jetting saga...
I spent the day on Sunday screwing with different combinations and it's getting close. Right now I'm at the 3rd clip from the top, 168 main, and 52 pilot.
First dropped the pilot from 55 to 52 and moved the clip to the second notch from top It idled but after running the engine seemed to be constantly "surging" at the idle position...not just when I let off on the gas but as it sat there. While riding it for several minutes I noted that there was some knocking...piston :shock: . After some key "french" words I started screwing with the air screw. I cranked in all the way in and the idle cleaned up (surge wise) but wouldn't idle. Revved the engine a couple of time and turned the screw to 1.5 out, cracked the thottle a couple times and the surges and knocks were back. Turned the screw in one turn so it's about .5 turns out. Idle ok, surges ok. Moral: the surging seems to be a lean condition. I found that my bike is sensitive to 1/4 turn increments. Went out and rode it. Lots of power from 0-50% throttle...big difference in power. Beyond mid fell on it's face but I'm not dealing with the topend range yet. By the way the temp was 80. Hotter=richer...right?
Here's where I'm at...the knocking scared me. I spent too much cash on this thing to destroy it. I dropped the clip to the third notch. No problems at that point but it doesn't launch like it did with the clip in the 2nd clip. I should have posted this yesterday because I can't remember if the knocking went away totally after setting the airscrew or when the clip was dropped. I think it did with the screw adjustment but I was still scared that I was too lean and dropped the clip to the 3rd slot. Am I safe leaving it in the 2nd position?
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