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TT store question...

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That appears to be the base. The mfg site doesn't say they only fit specific intake valves. If your question if they will fit your stock valve? From what I can tell, that would be the case... But, if you order, if you specify in your order notes to confirm, we'd be happy to do so.

From the mfg site:

Boyesens' revolutionary dual-stage Pro Series reed design delivers more usable power than stock. Your original one-stage reed operates most effectively only within a narrow RPM range. Boyesen's one soft reed on top of one firm flow-through reed gives you a wide range of intake control, plus increased intake velocity. Your original reeds can't possibly duplicate that performance.

Increased performance from start-up to top acceleration. Top racers and knowledgeable riders coast to coast make Boyesen Racing Reeds their first step in getting more power, more performance, and more pleasure from their high performance bikes. Offers the quickest acceleration any reed can offer.

The latest carbon fiber technology with all the advantages of Boyesen's patented dual-stage reed design

Utilizes a carbon fiber top reed and a durable fiberglass/epoxy bottom reed

Offers the quickest acceleration any reed can offer; maximizes horsepower and torque

Responds quickly and accurately to changes in piston speed for smooth, dependable throttle response

No sacrifice in reed life like traditional carbon fiber reeds

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