Automotive Parts [Lifetime Warranty] 729-17.7-30 Racing CVT Drive Belt
BlueStars 729-17.7-30 racing CVT drive belt in retail packaging.
Black 729-17.7-30 racing CVT drive belt with ribbed inner surface for scooter engine power transmission.
Collage showing scooters, go-kart, motorcycle, and ATV compatible with 729-17.7-30 racing CVT drive belt.
Infographic showing 729-17.7-30 racing CVT drive belt construction with four layers of high-quality materials.
Mechanic holding a 729-17.7-30 racing CVT drive belt with feature list overlay.
Racing CVT drive belt with 729mm length, 17.7mm width, and 30-degree teeth angle specifications.
Person driving a racing go-kart on a track, representing the performance of a 729-17.7-30 Racing CVT Drive Belt.
BlueStars 729-17.7-30 racing CVT drive belt in retail packaging.
Black 729-17.7-30 racing CVT drive belt with ribbed inner surface for scooter engine power transmission.
Collage showing scooters, go-kart, motorcycle, and ATV compatible with 729-17.7-30 racing CVT drive belt.
Infographic showing 729-17.7-30 racing CVT drive belt construction with four layers of high-quality materials.
Mechanic holding a 729-17.7-30 racing CVT drive belt with feature list overlay.
Racing CVT drive belt with 729mm length, 17.7mm width, and 30-degree teeth angle specifications.
Person driving a racing go-kart on a track, representing the performance of a 729-17.7-30 Racing CVT Drive Belt.
Lifetime Warranty

[Lifetime Warranty] 729-17.7-30 Racing CVT Drive Belt

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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.
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  • Perfect fit

    Perfect fit

    Continuously Variable Transmission CVT Drive Belt - Fit for 4 stroke GY6 49cc 50cc 139QMB 1P39QMB Long-case Engine Scooter, ATV, Go Kart, Moped.
  • Premium quality

    Premium quality

    Consists of 4 layers of top-grade materials: Top Fabric - EPDM Rubber - Aramid Fiber Cord with Adhesion Gum - Fiber-loaded Rubber.
  • Fixing symptoms

    Fixing symptoms

    Fix vehicle symptoms: cracked/ damaged belt, squealing noise, power steering/ AC not working, overheating engine, jerky acceleration, etc.
  • Simple installation

    Simple installation

    Put the belt onto the driving pulley first. Turn the pulleys slowly to let the belt slide in easily. Test running for 5 mins before use.
RUGGED BUILT FOR LONG-LASTING DURABILITY

RUGGED BUILT FOR LONG-LASTING DURABILITY

High-grade materials bring excellent degradation resistance to severe weather conditions, oil, and dust.
REDUCE VIBRATION AND NOISE

REDUCE VIBRATION AND NOISE

Allow smooth rotation with lower vibrations and noises by 45% for peak performance
EXCEPTIONAL PARTS, REMARKABLE JOURNEY

EXCEPTIONAL PARTS, REMARKABLE JOURNEY

Enjoy your seamless journey with the support of our replacement parts.

FAQ

This belt is designed for 4-stroke GY6 49cc, 50cc, 125cc, and 150cc engines. It is compatible with long-case engine configurations typically found on scooters, ATVs, go-karts, and mopeds equipped with 12-inch or 13-inch wheels. It fits a wide range of brands including Baja, Jonway, Roketa, Sunl, Tank, JMstar, Kymco Agility 50, Lance, and TaoTao.
Common symptoms of a failing CVT belt include a noticeable loss of top speed, sluggish acceleration, or a 'slipping' sensation when climbing hills. Visually, you should inspect the belt for fraying, missing teeth, cracks along the inner cogs, or excessive thinning. If the belt width has worn down significantly, it will no longer ride high enough in the variator pulleys to reach full gear ratio.
Yes, this belt is commonly identified by the dimensions 729-17.7-30. It is sometimes referred to as a 729-18-30 belt, as these specifications are often interchangeable depending on the manufacturer's labeling conventions for GY6 long-case engines.
To replace the belt, you will need a basic socket set to remove the CVT cover bolts and an impact wrench or a variator locking tool to remove the variator nut. A torque wrench is highly recommended for re-tightening the variator nut to the manufacturer's specifications to prevent damage to the crankshaft threads.
While replacing the belt, it is an ideal time to inspect your roller weights for flat spots and check the clutch bell for signs of overheating or glazing. Cleaning out the CVT housing with compressed air to remove belt dust will help the new belt run cooler and last longer.