729-17.7-30 Racing CVT Drive Belt

729-17.7-30 Racing CVT Drive Belt729 17. 7 30 Racing CVT Drive Belt Key Features Length: 729mm Top Width: 17. 7mm Groove Angle: 30 Construction: Reinforced, high durability compound for racing applications. Properties: Oil and heat resistant for consistent performance. Replaces Cross Reference Part Numbers 729 17. 7 30 729 17. 7 30 Compatibility & Fitment Engine Type: GY6 4 stroke "long case" engines Engine Codes: 139QMB, 1P39QMB Displacement: 49cc, 50cc Vehicle Types: Scooters,

729-17.7-30 Racing CVT Drive Belt

Key Features

• Length: 729mm
• Top Width: 17.7mm
• Groove Angle: 30°
• Construction: Reinforced, high-durability compound for racing applications.
• Properties: Oil and heat-resistant for consistent performance.

Replaces / Cross-Reference Part Numbers

• 729-17.7-30
• 729 17.7 30

Compatibility & Fitment

• Engine Type: GY6 4-stroke "long case" engines
• Engine Codes: 139QMB, 1P39QMB
• Displacement: 49cc, 50cc
• Vehicle Types: Scooters, Mopeds, ATVs, and Go-Karts
• Fitment Note: Typically used on models with 12-inch or 13-inch rear wheels.

When to Replace

• Visible cracking, fraying, glazing, or excessive wear on the belt surface.
• Slipping during acceleration or a noticeable loss of top speed.
• Unusual noise or vibration from the CVT case.
• As part of scheduled preventative maintenance per your vehicle's service manual.

Installation Tips

• Ensure the drive and driven pulley faces are clean and free of oil, grease, or old belt residue before installation.
• Install the belt with any directional markings pointing in the direction of forward rotation.
• Do not use tools to pry or force the belt onto the pulleys, as this can damage the internal cords.
• Allow for a brief break-in period of moderate, varied-speed riding.