Customer jetting for a KX500

Jetting and intake information
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Sandblaster
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Re: Customer jetting for a KX500

Post by Sandblaster » Sat Dec 05, 2020 10:21 pm

1984 KX500
All stock with Short body Air Striker carb

Pilot 52
Main 160
Side 7
Air screw 2 turns
Needle NEEDLE-JET N89D 16009-1613
Clip 2nd from the top
If bikes are for kids I'll never grow up.

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Sandblaster
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Joined: Thu Jun 07, 2012 3:50 pm
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Re: Customer jetting for a KX500

Post by Sandblaster » Tue Sep 28, 2021 5:14 pm

Pete N.
1995 KX500
Elevation: Sea Level
Carb Long Body Air Striker (Not Chinese)
Pilot: 42
Main: 165
Clip in 2nd from top with the SUZUKI NECJ needle.
1.5 turns out on air screw.
If bikes are for kids I'll never grow up.

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Sandblaster
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Re: Customer jetting for a KX500

Post by Sandblaster » Mon Jun 06, 2022 8:33 pm

High Port time, high compression engine
VP T2 fuel
sea level
38mm Air Striker Carb
Stic metering block
52 PILOT
190 MAIN
BLUE NEEDLE clip on the 2nd position
3 TURNS OUT ON THE SCREW
If bikes are for kids I'll never grow up.

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Sandblaster
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Re: Customer jetting for a KX500

Post by Sandblaster » Wed Jul 06, 2022 6:35 pm

From Steve Paxton:

Mike here are my 1993 KX 500 settings.
My home altitude is 3500ft to 5000ft around Vegas, riding Desert washes and mountain single line.
I also race/ride upwards of 6500ft to 9000ft
In mid state locations.
I get excellent performance and mocha brown plug readings when up that high.
I have no problems at home with the same settings.
I installed a new 38mm air striker and had Sudco do initial jetting. At the same time I refreshed my top end with new NOS "A" piston, and sent that to Mellinium Technologies to match my "A" cylinder bore with new plating. Along with my knife / Grinding honing of all lead edges of intake locations at Reed cage and bottom of my cylinder. (My only mods to the engine) also replaced the Reeds.
I ultimately ended up going leaner one pilot size. After many settings trials.
The bike runs pump gas 97 octane,
Amsoil Interceptor oil at 50:1
I run a #9 plug
38mm Keihin Quad Vent Air Striker settings
for higher altitudes in Desert...
Here is where it runs, and performs at it's best, out pulling many 450f bikes. 😉
Main jet 160
Pilot jet. 55
Needle # 48-DGH (clip 2 from top)
Air Screw 2.25 turns


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If bikes are for kids I'll never grow up.

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