Secondary transmission Honda SH 125/150cc 15/39 Polini

Secondary Transmission Polini (d.15/39) Honda SH 125i / 150i 2005-2012

The transmission ratios extend the final ratio of the motorcycle. If the engine has enough power and can handle a longer transmission ratio, the top speed increases.

The original cylinder in most cases does not have enough power, it will need to be replaced with a more powerful one.