I read an article that stated if you change the rear drive pulley to a 55 notch setup, it'll lower the RPMs by about 300 @ 70 on the interstate.
Then Osco asked "What would you need to do to correct the speedo..?"
Extremely good question!
Anyone?
Anybody?
If a Sportster has 29-tooth front and 61-tooth rear belt pulleys (like most stock 1200's), the engine will be turning 2500 rpm at 55 MPH, 2950 rpm at 65 MPH, and 3400 rpm at 75 MPH. Change to a 55-tooth rear pulley (keeping the 29-tooth front pulley), and the engine will be turning 2250 rpm at 55 MPH, 2650 rpm at 65 MPH, and 3050 rpm at 75 mph.
Extremely good question!
Anyone?
Anybody?
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