Maintenance & Technical > KX500 Original

Jetting!!! Again and again and again!

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KXcam22:
Slow,
  172 seems rich, even at your altitude of 1300'.  The 55 is about right possibly a touch lean for colder weather.  I need more info:

1. What is your needle and clip position?
2. Type of riding
3.  Plug heatrange and type.
4.  premix Oil brand and mix ratio
5. Perfomance modifiations.
6. Is the float level set correctly.

Cam.

atrain40:
my bike had stock jetting with 168main/60pilot and ran good at 1000-2000ft but seemed to splooge a ton and seemed like it was a little rich and didnt have that topend punch. so i changed the main to a 162 and pilot to 55 seems to have more topend zing. and i will test it out this weekend to see how it runs and if the splooge stops i mix it at 32:1 and like to put enough oil in the gas to be safe. will probly lean the main out more when i go to kennedy meadows which is 7500-9000ft in elevation but dont know how lean. thanks

slow600:

--- Quote from: KXcam22 on May 26, 2009, 03:45:14 AM ---Slow,
  172 seems rich, even at your altitude of 1300'.  The 55 is about right possibly a touch lean for colder weather.  I need more info:

1. What is your needle and clip position? not sure needle type, second clip from top
2. Type of riding. street legal supermoto
3.  Plug heatrange and type.  standard ngk
4.  premix Oil brand and mix ratio. belray 50:1
5. Perfomance modifiations. kips bolt, pc platinum 2, pc silencer, window piston, thin head gasket.
6. Is the float level set correctly. float set correct

i obviously wasnt fully prepared for this, thanks for the help. my gut says go down on pilot to resolve hot start issue, gonna go back to 170 main since it seems to run stronger that way.
--- End quote ---

matzilla:
I recently thought I had a jetting problem when I noticed my 88 wasn't running right at higher RPMs. It has warmed up here a lot lately, and when we put it together recently we jetted it a bit rich just to protect the shiny new parts during break in. I actually used Dumonde Tech break in oil. It still ran great at low RPMsn but would sputter and dog out up high. I thought for a minute about the plug, but figured if it was fouled it wouldn't run at all. After talking to a friend I changed the plug and what a difference! Cleaned up completely. Runs great again. The pilot was a bit rich, but with some minor air screw adjustment is much better too. I just wanted to share what I learned about how a fouled plug will still run, just not efficiently.

500freak:
hi guys.. i was looking at some of the jetting charts on here and seen that my carb i way out. it has a kiehin pwk with a 162 main and a 50 something pilot jet with the clip on the 1st notch. but the bike actually loads up on the bottom end.... what gives??? after starting and warm up it takes to 3rd gear to clear out. even when its hot if you idle down a long hill it will load up alittle. i mix it 40-1 with amsoil full synthetic for power valves with 110 mixed 50/50.  any one have any idea....

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