Primary Transmission Polini 16/51 Yamaha 50cc 4-stroke 3V

This Polini Primary Transmission 16/51 Yamaha 50cc 4-stroke 3V with helical teeth for 4-stroke Minarelli engines will change the gear ratio of your transmission so the surplus power of a tuned engine can be adequately handled and transmitted, be it in terms of top speed of acceleration. The quality of the gears is, as per usual with Polini, outstanding – precisely machined and very robust.

Change of gear ratio in most cases involves changing the variator weights as well to avoid losing torque / acceleration. And please do not forget to change the gear oil.

• gear ratio: 16/51
• primary gear