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At 4000 RPM in 3rd I'll be doing about 50 mph, in 4th about 60 mph and in 5th about 70 mph with a 19-t sprocket and plenty of throttle left
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Are you sure about that 70 MPH RPM? My speedy with the stock 16 does about 4100 RPM at 70 ! You should be at probably 3500-3700 at 70 i would think unless the gearbox on the boniie is shorter. But i always heard the speedy was shorter internally. But even if they're the same and the speedy is only shorter due to the sprocket, you should be well under 4k. Or maybe it's tire size?
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2005 Speedmaster, Neon Blue, Thunderbike pipes, snorkel removed, UNI filter, drilled airbox, 130 mains, TBS needles.(2 shims) And speaking of Speedmasters, HERE'S MINE
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