The combined benefits built into the Boyesen TwinShot kit create a synergistic effect that will make the stock Keihin CV carburetor react as if the bike were fuel injected. The combination of the 5% stiffer actuator arm spring and the precision piston rod ensures that when the throttle is turned, the piston rod acts on the diaphragm. This forces fuel into the dual sprayer and shoots a double dose of fuel directly into the carburetor bore. Fits all Buells equipped with a Keihin CV carburetor from 1998 to 2004, Evolution Big Twins from 1990 to 1999, Twin Cam models from 1999 to 2006 and Sportsters from 1988 to 2006.
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