secondary transmission gear set 101 Octane 16/42 ratio -101 OCTANE- for Honda Dio

Who doesn't know it? Performance tuning with big bore cylinders: The scooter accelerates better, but it doesn't get much faster. The relatively weak original engine is geared too short.
With a modified gear ratio the scooter can be tuned to a much higher engine power and the top speed increases.

Number of teeth: 16/42_{AI-translation}