The percentage figures are, if multiplied by the engine rpm. will give the rev drop between the gears. For example, top gear on the road bike at 10,000 rpm is equivalent to 1,110 rpm, whereas the Race Bike ratio has a rev drop of 780rpm.
The overall reduction ratio for a race gearbox of this type of engine is normally around 55%, which means that 1st gear will always be slightly less than half the maximum speed obtainable, which differs considerably from the lower geared road bike as illustrated by these figures.
The gearbox comprises of input shaft and all loose gears. It is assembled using standard Honda bushes, spacers, circlips and output shaft from the original machine.