GY6 100cc 69mm Valve Bore Cylinder Rebuild Kit with 50mm Bore Upgrade - Includes Racing CDI, Ignition Coil, Spark Plug & Clutch Spring - Compatible with 49CC 50CC 139QMB Moped Scooter Engines - Perfect for Scooter Performance Upgrades & Engine Rebuilds
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Estimated Delivery:7-15 days international
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SKU:25943477
Product Description
This Cylinder Rebuild Kit is fitment for GY6 49CC, 50CC, 139QMB engines in motorcycles, scooters, ATVs, and karts. It upgrades 50CC/60CC/80CC engines to 100CC, significantly enhancing RPM, power, and top speed. No EGR system required. Core Components Includes: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, and 3-electrode spark plug etc. Valve materials:Exhaust valve use 53Cr21Mn9N94N high-strength steel，Intake valve use 40Cr10Si2Mo alloy steel. Automated machining + plasma surfacing technology for wear resistance, high-temperature strength, and airtight durability. Installation Tips:Ensure piston markings face upward during installation, with the 6mm small hole facing away from the engine. › See more product details
Product Features
This Cylinder Rebuild Kit is fitment for GY6 49CC, 50CC, 139QMB engines in motorcycles, scooters, ATVs, and karts. It upgrades 50CC/60CC/80CC engines to 100CC, significantly enhancing RPM, power, and top speed. No EGR system required.
Core Components Includes50mm 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, and 3-electrode spark plug etc.
Valve materialsExhaust valve use 53Cr21Mn9N94N high-strength steel，Intake valve use 40Cr10Si2Mo alloy steel.
Automated machining + plasma surfacing technology for wear resistance, high-temperature strength, and airtight durability.
Installation TipsEnsure piston markings face upward during installation, with the 6mm small hole facing away from the engine.
