Is this a RB Carb?

Questions and Answers about the best carb and Head mods available for the KDX.
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Charl
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Is this a RB Carb?

Post by Charl »

Hi All,

Julien spotted this "mod" on the top of my needle tube - I see from pics on the net, its not stock.

Mine:

Image

Stock:

Image

With thanks to E-Dirt for the pic
http://www.e-dirt.co.za/forum/forum_posts.asp?TID=37772

RB:

Image

With Thanks to RB Designs for the Pic

http://www.rb-designs.com/kdx200-220.htm

Anybody know any other features to identify if this carn has been worked by RB? (Other than the dividing plate)
Isn't it funny how knee down is painfull off road, yet foot out is likely impending doom on a Superbikes?
Charl
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Is this a RB Carb?

Post by Charl »

Me again - so been musing on this - the block looks professional done, the carb body is in need of a spit and polish. Conclusion - an RB block somehow mated to a stock carb body? I know that the spray tube is flat on a four stroke, and angle cut on a two stroke, but am unsure what effect this cutout has on performance, and where in the rev range the change is targeted at. Penny for your thoughts... :hmm:
Isn't it funny how knee down is painfull off road, yet foot out is likely impending doom on a Superbikes?
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Julien D
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Re: Is this a RB Carb?

Post by Julien D »

Interesting find. I'll take a look at my RB carb and see if that notch is present and get back to you.
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Tedh98
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Re: Is this a RB Carb?

Post by Tedh98 »

My RB carb has the notch.

But this carb is definitely not an RB carb and it has the notch:
Image

I'm wondering if that notch is even one of his modifications?
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Julien D
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Re: Is this a RB Carb?

Post by Julien D »

I am not thinking so. I have come think it's a difference in newer vs older PWKs, after scouring for pics.

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fuzzy
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Re: Is this a RB Carb?

Post by fuzzy »

Wonder if it's a difference between KDX OEM carb, and a "Retail" carb? They are different.
'91 KDX 200 Project $300 KDX
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Jaguar
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Re: Is this a RB Carb?

Post by Jaguar »

lowering the engine side of that needle tube will make like the mid range is jetted richer.
Performance CDI -- KDX motocross mods -- the SR KDX -- expansion chamber analysis---> http://www.dragonfly75.com/moto/
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