2002 CR250R Keihin swap questions

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6/19/2018 10:37 AM

I have an 02 CR250R that is in immaculate shape. The only thing aftermarket about the entire motor is a set of V Force 3 reeds, and a Wiseco piston and rings (stock spec). I’m having the notorious carb problems these bikes have with the stock Mikuni, and decided it’s time to switch to the Keihin PWK 38. My main question is do I want to get the regular PWK, or the air Stryker carb? My second question is what exactly is the difference between the two carbs, and lastly, where is my best option to purchase a new one? Thanks in advance Photo
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6/19/2018 5:23 PM
Edited Date/Time: 6/19/2018 5:25 PM

You want the air stryker(AS) version of the PWK. It provides better lowend response.

The cheapest( new) way to achieve the results you want are to buy a new OEM PWK from an 00' Honda cr250 along with the jetting to get it to work properly.

https://www.partzilla.com/product/honda/16100-KZ3-J21?ref=acc3d564dad4cec09c3221dc8a85811ba8cfef42

needle-- https://www.partzilla.com/product/suzuki/13383-37FL0?ref=5a77878e9329e098fcedea2aaeff653085536f51 startout in the #3 clip position with as 42 pilot jet and 172 main.

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6/19/2018 7:46 PM

I have a genuine pwk, 99 cr250 pm if interested.
They are very good carbs, but if you choose to try and jet that mikuni, the s4 nozzle is part of the puzzle.

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Livin' the dream, two wheels at a time!

6/19/2018 7:52 PM

If you get a Keihin, get a STIC metering block as well. You'll thank me later.

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6/22/2018 6:34 AM

digger wrote:

You want the air stryker(AS) version of the PWK. It provides better lowend response.

The cheapest( new) way to achieve the results you want are to buy a new OEM PWK from an 00' Honda cr250 along with the jetting to get it to work properly.

https://www.partzilla.com/product/honda/16100-KZ3-J21?ref=acc3d564dad4cec09c3221dc8a85811ba8cfef42

needle-- https://www.partzilla.com/product/suzuki/13383-37FL0?ref=5a77878e9329e098fcedea2aaeff653085536f51 startout in the #3 clip position with as 42 pilot jet and 172 main.

Thanks digger. I’ve read a few of your other posts about this as well. I’m riding around roughly 1400 ft above sea level, any recommendations or tips you could give me on the jetting would be much appreciated.

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