47mm 139QMB Short Case Engine - Parts Categories

This GY6 80cc engine, identified by the 139QMB/139QMA designation, features a 47mm bore and a short crankcase design. It's a complete 4-stroke engine replacement for scooters and mopeds, offering enhanced performance for enthusiasts.

• 47mm Bore & 80cc Displacement: Provides a significant power upgrade over standard 49cc engines, leading to improved acceleration and top speed.
• Short Crankcase Design: Engineered for easier fitting in a wider range of scooter chassis, ensuring compatibility and streamlined installation.
• Complete 4-Stroke Engine: Arrives as a fully assembled unit, simplifying the replacement process and minimizing downtime for your ride.
• Drum Brake Compatibility: Specifically set up to integrate seamlessly with drum brake systems for reliable stopping power.
• Includes Premium Lubricants: Comes with 1 Liter of Bel-Ray Gear Saver Hypoid Oil 80W-90 and 1 Liter of Bel-Ray Scooter EXL Mineral 4T Engine Oil 10W-40, essential for initial setup and operation.

Compared to previous generations or standard 49cc engines, this 80cc GY6 unit offers a noticeable jump in performance without requiring extensive modifications. Its short case design enhances fitment versatility, while the inclusion of high-quality Bel-Ray oils ensures proper lubrication from the moment you begin setup, protecting your investment.

Key Technical Advantages: Technology and Performance

This GY6 80cc engine leverages advanced 4-stroke technology to deliver robust power and efficiency. Its precise 47mm bore and optimized combustion chamber contribute to superior torque and horsepower, outperforming less potent alternatives. The short crankcase engineering not only aids installation but also contributes to a balanced weight distribution, crucial for agile handling. Built for reliability and performance, this engine is designed to provide a thrilling, upgraded riding experience for your scooter or moped.