CVT Drive Belt 729-17.7-30 for 4 Stroke GY6 49cc 50cc 139QMB 1P39QMB Long Case

CVT Drive Belt 729-17.7-30 for 4 Stroke GY6 49cc 50cc 139QMB 1P39QMB Long Case

This CVT Drive Belt 729-17.7-30 is a replacement drive belt designed for 4 Stroke GY6 49cc and 50cc engines, transmitting power from the variator to the clutch for smooth acceleration. It fits Long Case applications and is a direct cross-reference for engines using the 139QMB and 1P39QMB platforms.

Overview

This CVT Drive Belt 729-17.7-30 is a high-strength replacement belt built for 4 Stroke GY6 49cc and 50cc scooter engines. It transfers engine power through the continuously variable transmission, ensuring dependable speed and torque. This CVT Drive Belt is designed for Long Case configurations common on 139QMB and 1P39QMB engines.

Built For Performance

• Precision-cut width of 17.7 mm for consistent grip on variator and clutch faces
• Reinforced rubber compound resists heat and wear during sustained operation
• 33.5 mm effective length matches OEM specifications for 729-17.7-30 sizing
• Flexible construction reduces vibration and delivers smooth power transfer
• Tested for compatibility with Long Case CVT housings

Fits These Machines

• for 139QMB
• for 1P39QMB
• for 4 Stroke GY6 49cc
• for 4 Stroke GY6 50cc

On-The-Job Use

• Replaces worn belts on 49cc and 50cc scooters with Long Case CVT assemblies
• Suitable for daily commuting and light-duty urban riding
• Works in variator-driven transmissions requiring 729-17.7-30 dimensions
• Ideal for maintenance rebuilds of GY6 engine platforms

Specs At A Glance

Good To Know

Q: How do I know this CVT Drive Belt fits my scooter? A: Check the belt dimensions (729 mm length, 17.7 mm width) against your existing belt, and confirm your engine is a 139QMB or 1P39QMB with a Long Case housing. Most GY6 49cc/50cc scooters with this case type will accept this belt.

Q: What happens if I install a belt with the wrong width? A: A belt that is too wide or narrow can cause slippage, poor acceleration, or premature wear on the variator and clutch faces. Always match the 17.7 mm width to your specific CVT components.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.