KX500 Jetting?

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8/1/2018 12:21 PM


Looking for some jetting specs and tips, currently running the stock carb, but it has been taper bored. The engine was rebuilt with some mild porting and I always run race fuel at 36:1. Typical race elevations here in So Cal are anywhere between 1000ft and 4000ft.

Thank you!!

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Do It In The Dirt!

8/1/2018 1:18 PM

Got these from Tom Morgan...: ....168 main 50 pilot... R1368 needle 3rd clip. Of course pipes, carb mods, porting , Temps, fuel, riding conditions need to be taken into account.

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8/1/2018 1:38 PM

sandman768 wrote:

Got these from Tom Morgan...: ....168 main 50 pilot... R1368 needle 3rd clip. Of course pipes, carb mods, porting , Temps, ...more


Much appreciated Sandman!
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Do It In The Dirt!

8/3/2018 12:05 PM

Team Green Specs
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Bret Bonham

8/7/2018 5:43 AM

Bret wrote:

Team Green Specs
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Thanks Bret,

When I bought it, it came with a 165 main with a N82M #2 and a 52 pilot.

Tried a 170 main, needle in same position and a 55 pilot and it won't idle no matter how far I back the air screw out.

Going to try a 168 main, needle at #3 position and a 52 pilot. If that doesn't do the trick, I'll try a 50 pilot.

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Do It In The Dirt!

8/8/2018 9:14 AM

I ran a 45 pilot in my CR500. It helped with starting and idling. I was running 110 octane and Klotz Supertechniplate at 40:1. Crisp...... Was also on 168 main.

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8/8/2018 9:25 AM

rallendude wrote:

I ran a 45 pilot in my CR500. It helped with starting and idling. I was running 110 octane and Klotz Supertechniplate at 40:1. ...more


Thanks for the reply.

Last night I tried the CEN needle (in the middle clip) that Sudco recommended. What a difference!! I set the air screw at 2 turns out and I have plenty of adjust-ability with the idle screw. Now I'm gonna see what pilot and main combo seem to work best with that needle.

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Do It In The Dirt!