batman
Serious Thumper
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SuzukiSavage.com Rocks!
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osceola new york
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I did not drill a third hole in the slide but increased both of the original vacuum ports. the Gagetman Groove ,was done mostly to improve fuel mileage , and increased mine by 3.5 mpg /9.8 miles/per /tankful (2.8 gallons) in mixed riding . A side benefit seemed to be a smoother idle ,in spite of less fuel usage , this occurs because the fuel at idle slides down the back of the throttle plate ,encounters the grove ,bounces off the front of the basically V shaped groove ,which both further atomizes the fuel and directs this flow upward in the intake passage. This allows backing out your throttle speed adjustment screw and provides most of your increase in mpg. Without the groove fuel is less atomized , because it merely tries to follow the floor of the intake passage, the opposite of what happens at higher throttle settings.
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