My Cart



Athena 057115 Primary Gear


Generally ships to addresses in the contiguous United States the same business day if ordered by 12:15PM Central Time!

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.
Ratio: 15/50.
Percentage: 21%
Yamaha YJ50 Vino 2002-2004

Please Note: