dsaint77
02-20-2006, 04:40 PM
I asked a guy on ebay selling them which was better. I dont know. his response;
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Good day,
We use the 39mm PWK ourselves, however
Depending on how you ride or race will point us in the direction of carburetion.
The 38mm PWK Air Striker incorporates lower air horn fins focusing Air volume to the needle jet for increased bottom to mid-range throttle response. This type of carburetor offers great performance for track, dunes, tree dogging and enthusiast dragging.
http://www.1dirracing.com/catalogs/product.php?productid=16443&cat=430&page=1
The 39mm PWK (as we run on most all our 250R engine designs) is great for over-all performance with an emphasis to Top-End fuel performance. This carburetor offers great all around performance for riding and racing requirements. If you wish to leverage your engine design for a top-end Hi/Over-Rev great for drag and hill, track and dunes, go with our 39mm Keihin PWK.
http://www.1dirracing.com/catalogs/product.php?productid=16444&cat=430&page=1
The 41mm PWK is offered as our Drag Pro-Series Carburetor and is taper bored with reshaped air horn and throttle valve improving Air/Fuel Dynamics necessary for to match engine designs for drag racing.
http://www.1dirracing.com/catalogs/product.php?productid=16445&cat=430&page=1
Check out Our G3 Power Curve Reed Valve it will open your eyes to great performance as well.
http://www.1dirracing.com/HondaCat.htm
We carry everything in stock and always offer Free Technical Assistance helping you dial everything in.
Here are our reference diagrams for the Keihin PWK Carburetors:
https://www.1dirracing.com/pdf/carbs/Keihin-PWK-Carbs.pdf
Performance Review:
https://1dirracing.com/pdf/G3FullReview.pdf
Carb Jetting for Performance:
https://1dirracing.com/pdf/JettingPerformance.pdf
Hope this helps,
1Dir Racing
800.310.7858
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now if I buy one of these larger carbs what about my stock intake boot, will it fit or will I have to change it out? should I get one of their reed cages too? is there a reed cage with a boot for the trx250r?
second question; I would like to keep a stock air box in there even though it will restrict performance some. Will that boot from the box line up and slip over or is there an aftermarket for larger bells on these carbs?
------
I have a honda 250r, LRD adjustable pipe bored .60 over and I am going to put on a 21 cc cool head and will be running 93 octane.
thanks for the help in advance.
Adam
----------------------------------------------------------------------------------------------------------------------------
Good day,
We use the 39mm PWK ourselves, however
Depending on how you ride or race will point us in the direction of carburetion.
The 38mm PWK Air Striker incorporates lower air horn fins focusing Air volume to the needle jet for increased bottom to mid-range throttle response. This type of carburetor offers great performance for track, dunes, tree dogging and enthusiast dragging.
http://www.1dirracing.com/catalogs/product.php?productid=16443&cat=430&page=1
The 39mm PWK (as we run on most all our 250R engine designs) is great for over-all performance with an emphasis to Top-End fuel performance. This carburetor offers great all around performance for riding and racing requirements. If you wish to leverage your engine design for a top-end Hi/Over-Rev great for drag and hill, track and dunes, go with our 39mm Keihin PWK.
http://www.1dirracing.com/catalogs/product.php?productid=16444&cat=430&page=1
The 41mm PWK is offered as our Drag Pro-Series Carburetor and is taper bored with reshaped air horn and throttle valve improving Air/Fuel Dynamics necessary for to match engine designs for drag racing.
http://www.1dirracing.com/catalogs/product.php?productid=16445&cat=430&page=1
Check out Our G3 Power Curve Reed Valve it will open your eyes to great performance as well.
http://www.1dirracing.com/HondaCat.htm
We carry everything in stock and always offer Free Technical Assistance helping you dial everything in.
Here are our reference diagrams for the Keihin PWK Carburetors:
https://www.1dirracing.com/pdf/carbs/Keihin-PWK-Carbs.pdf
Performance Review:
https://1dirracing.com/pdf/G3FullReview.pdf
Carb Jetting for Performance:
https://1dirracing.com/pdf/JettingPerformance.pdf
Hope this helps,
1Dir Racing
800.310.7858
---------------------------------------------------------------------------------
now if I buy one of these larger carbs what about my stock intake boot, will it fit or will I have to change it out? should I get one of their reed cages too? is there a reed cage with a boot for the trx250r?
second question; I would like to keep a stock air box in there even though it will restrict performance some. Will that boot from the box line up and slip over or is there an aftermarket for larger bells on these carbs?
------
I have a honda 250r, LRD adjustable pipe bored .60 over and I am going to put on a 21 cc cool head and will be running 93 octane.
thanks for the help in advance.
Adam