Hey guys,
I'm gathing parts for my cafe racer. After reading that the gearing is lower on an F trans I bough a primary shaft full of gears from an F engine (I hope). In this write up from cycle guide it mentions that the spockets on the shaft are uped 2 teeth to 50. But when I counted the teeth on the spockets I came up with 41. Are they totally wrong in this write up? Maybe they were not good at counting back then?
Here is the write up:
As in previous CB750s, the F model’s crankshaft rides in five plain inert bearing. Power is still delivered to the clutch through two single-row chains that drive a jackshaft, but two teeth have been added to the jackshaft sprockets; they now have 50 teeth each for a ratio of 1.985:1. The wet clutch has been modified to allow more oil to get at the plates, which is an effort to reduce the friction plate distortion and glazing that make the clutch grabby and noisy. The seven friction plates have also been altered slightly and the center has been changed.
The first three ratios of the five speed transmission are the same, but the forth and gear ratio has gone from 1.097:1 on the K5 to 1:133:1 on the F, and the fifth gear ratio has been changed from 0.939:1 to 0.969:1.
The transmission sprocket has also shortened the overall gear ratio by giving away one tooth for a new total of 17 teeth. It drives the same 48-tooth rear wheel sprocket through a new R K brand chain designed by Honda R and D.
All those changes mean that the Supper Sport’s first three gears are 23% lower than the K5’s, and the forth and fifth are 27% lower.
The drive spocket that came with the set is 17 teeth which gives me hope, but how do I make sure I have F gearing on my shaft?
here's a photo of what I have..
