Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
gowen:
Continued: Well, I have worked more on the jetting on the big KX trying to get it perfect. I decided to continue, A, cause my cast is now gone :-D, & B my idle is still kinda slow with the screw all the way in. So, here I go again, BTW, clean airfilter, new topend, and good reeds. I left off at 45 Pilot, top clip (bottomed out), and a 162 main jet. Well, I decided to drop the pilot again, just to see if it helps, and yes, my idle has raised a notch, using the air screw slowly, I have found that 2.5 turns out has given the best idle responce. It has greatly improved the idle and the 1/8th throttle. It's amazing how low I'm having to go for a KX. Being that I'm at 42 at 2.5, I'm hoping to get my hands on a 40 to see how it is going to work. But, so far, moving down has helped alot.
The needle is still at the lowest point, top notch. When I would hit between the 1/4th to 1/2th throttle, it would not respond right away, it would bog a second and then hit hard. So, I think I will lift the needle a notch tomarrow to richen the circut on the needle.
The main jet is still a wonder. I decided to do a throttle chop dealy and see how it works, at a 162 I did a WFO for about 30 seconds, pulled the NEW plug out and saw a light tan on the insulator up high. Then did another WFO run for about 1 minute and revealed a light tan on the tip and a grey base/almost like a light black. Assuming not lean, but more rich, not sure, I will get pictures.
I'm afriad that I'm moving too far into this, but being that it is still not idling very well (as well as it should). I'd hate to end a riding day early to to a d**n seizure. Any oppinions?
Updated Carb Specs:
42 Pilot
2.5 Air Screw
1st clip (lowered to last notch)
#7 Slide
162 Main Jet
Thanks
kawdude:
I'm concerned with doing a wot and letting off the gas with a 42 in it. I'm still playing with mine and will post what I do for comparison. Right now I've got a 55, clip in 2nd pos. and 165 main. Popping pretty good. Dropped to 3rd and reduced the popping.
gowen:
Well, here is where I'm at so far, I've moved to the second notch due to a slightly lean mid throttle range. That seems to have done the trick for the mid range/top-end range. It has done well, but we finally got a 50% humidity day here and I took it to the track yesterday and did some trails and got ALOT of smoke during the trails part, but on the track, no problem, except for wide open runs for a brief second, I get ALOT of smoke, but eventually goes away, until I let it idle or keep the rpms/throttle down. After a few runs on the track the idle starts moving in the upper range (finally) and starts acting lean, as in surging, nearly causing an accident as the throttle was over sensitive. So, I moved the air screw back to a 1.5 and that fixed the major surging and sensitivity, but caused a load more smoke. So, it feels like I may be lean, but the smoke is killing me and the riders behind me. I'm starting to think my main jet is rich, but being at a 162, I have my doubts. Any thoughts?
Paul:
What are you running for a fuel:oil mixture?
gowen:
--- Quote from: Paul ---What are you running for a fuel:oil mixture?
--- End quote ---
32:1 running Super Techniplate and sometimes Benol by Klotz.
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