Maintenance & Technical > KX500 Original

Help me verify this is a PWK 38 and why was there a change from the PWK 39?

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Hawkeye58:
Hi all,
Please help me verify my carb is a PWK 38.
Also, why did team green change from the PWK 39 to the PWK 38?

sandblaster:
Well... I can tell you what it is not...
It is not a KX125, KX250, or KX500 of any year.
Anything in the V800 range is early to mid Kawasaki as the V800's were discontinued on the dirt bikes around 1995.
Why did team green go to the 38mm?
Because the 97 KX250 used a 38mm Keihin Air Striker which is a superior carburetor in every way.
It will add 1 hp to the rear wheel on a completely stock KX500.. That is dyno confirmed.
The flow bench shows that it does just as well as a 41mm Airstriker for volume and velocity. That is also dyno confirmed...
As a bonus, it gives you more torque on the bottom end :-)

Hawkeye58:
Sand Blaster,
Thanks for the information.
Though that is a bit depressing. I now wonder what the prior owners of this bike were doing?
What this carb really is? I have had the 500 for almost four years, it hasn't really ever run to it's full potential.
I keep improving it, and now desire to figure out this carb.

Hawkeye  :?

Hawkeye58:
The Carb has a #7 slide,  and a N82R Needle.

Hawkeye  :|

Hawkeye58:
Sand Blaster could this carb have been the stocker from when the bike was built. It's a 1993 KX 500.

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