G'day Viking.
Equivalent to a 23. 60 MPH at 3250 RPM, she'll just do the ton in 3rd, 125 MPH in top. 
125MPH @ 6500 RPM , uhhh must have an extreem tall gearing, and hard tuning to get to that......
My RGS engine has 23T engine sprocket, 43 clutch drum. 21T gearbox sprocked, 42T rear drum, with 19" tyre.
This gives an overall gearing at 3.74 and a teoretical max speed in 4th gear at 98 MPH @ 6500 RPM
(date applied to the Steve Nott spread sheet, gives over all garing and speed in gears)
100 mph in 3rd. @ 6500 RPM, you need at least a 21" tyre to achive that.
What gearing do you use and how is the engined tuned ?
