Athena 057115 Primary Gear

Ratio: 15/50.
Percentage: 21%.

State-of-the-art clutch kit allows for greater acceleration and engine torque than stock. Performance-matched drive belts are specifically designed to handle the power supplied by Athenas big bore kits for scooters. Primary gear sets feature a higher gear ratio than stock (22%-33% depending on model) for a higher top-end speed. Clutch weights also available separately in three weights for fine-tuning clutch engagement.

Vehicle Fitment:

2002-2004 Yamaha YJ50 Vino