Cylinder Rebuild Kit for GY6 49CC, 50CC, 139QMB Engines

Upgrade your motorcycle, scooter, ATV, or kart with this high-performance Cylinder Rebuild Kit designed specifically for GY6 49CC, 50CC, and 139QMB engines. Transform your engine from 50CC/60CC/80CC to an impressive 100CC, significantly boosting RPM, power, and top speed without the need for an EGR system.

Core Components Include:

• 50mm Cylinder Body Kit
• 69mm Valve Cylinder Head Assembly
• Camshaft and Camshaft Seat Kit
• Full Gasket Set
• Oil Pump and Gears
• Spring Set
• Pure Copper Roller Assembly
• 6-Pin Racing AC CDI
• Ignition Coil
• 3-Electrode Spark Plug

Durable Valve Materials:

• Exhaust Valve: Made from 53Cr21Mn9N94N High-Strength Steel
• Intake Valve: Crafted from 40Cr10Si2Mo Alloy Steel

Advanced Technology:

This kit features automated machining combined with plasma surfacing technology to ensure:

• Superior Wear Resistance
• High-Temperature Strength
• Airtight Durability

Installation Tips:

For optimal performance, ensure that the piston markings face upward during installation, with the 6mm small hole positioned away from the engine.

This Cylinder Rebuild Kit is your key to unlocking enhanced performance and reliability in your engine. Upgrade today and experience the difference!