Automotive parts for small-displacement scooters promising better hill-climbing performance and a complete rebuild solution. Riders who struggle on inclines will welcome the stronger low-end and the convenience of a full parts set. Does TRKIMAL GY6 50cc Cylinder Rebuild Kit deliver the improvements most owners need?
⚡ At a Glance
- • Engine Performance: Designed to increase low-end torque for improved hill-climbing
- • Best for: Owners of GY6 50cc 139QMB scooters seeking a full rebuild upgrade
- • Not ideal for: Engines with non-GY6 139QMB patterns or those needing electrical upgrades
A comprehensive rebuild kit aimed at GY6 50cc 139QMB engines, intended to improve hill-climbing capability and include the parts required for a full overhaul. Seller support is offered with an aim for customer satisfaction.
Stronger uphill acceleration – thanks to a larger 50mm bore and 64mm valve
A 50mm cylinder bore increases swept volume, and a larger 64mm valve improves airflow into the combustion chamber, together supporting greater torque output. These changes favour low-end power useful at lower rpm ranges.
More confident hill starts and steadier climbs, especially on steep gradients, with less need to ride the clutch or over-rev the engine.
One-kit rebuild convenience – with a full set of matched components
The kit includes cylinder head comp, cylinder body, piston, piston pin, piston ring, pin clip, valve rockers, oil pump, oil sprockets, complete gaskets, roller and bolts, ensuring compatibility between parts. Matching components reduce the chance of fitment issues during assembly.
A single purchase supplies everything needed for a comprehensive rebuild, saving time sourcing parts and reducing the risk of mismatched components.
Straightforward fitment for common engines – with GY6 50cc 139QMB compatibility
Specification details list fit for GY6 50cc 4-stroke 139QMB engines and a 13mm piston pin dimension, aligning with common small-scooter build standards. The set targets widely used mounting and pin sizes for direct replacement.
Simpler installation for mechanics familiar with GY6 139QMB patterns, lowering the amount of modification or machining typically required.
✨ The 4 Key Reasons for TRKIMAL GY6 50cc Cylinder Rebuild Kit
- 50mm cylinder bore – Noticeably more low-end torque for steep hill climbs
- 64mm valve – Improved airflow, stronger combustion for sustained uphill performance
- Complete parts kit – All essential components included so rebuilds avoid missing parts delays
- Compatibility with GY6 139QMB – Direct fitment reduces modification and simplifies installation process
📋 Technical Details at a Glance
- Category: Automotive Parts and Accessories
- Fitment: GY6 50cc 4-stroke 139QMB engines
- Cylinder bore: 50mm
- Cylinder head: 50mm
- Piston pin: 13mm
❓ Frequently Asked Questions
Q: Will this kit fit my GY6 50cc 139QMB engine?
A: Compatible with GY6 50cc 4-stroke 139QMB engines, so direct fitment is expected for that engine pattern.
Q: What parts are included in the kit?
A: Includes cylinder head comp, cylinder body, piston, piston pin, piston ring, pin clip, valve rockers, oil pump, oil sprockets, complete gaskets, roller and bolts.
Q: Will this improve hill-climbing performance?
A: A 50mm bore combined with a 64mm valve is designed to increase power for climbing hills, improving low-end torque for steeper gradients.
🏆 Our Verdict
Ideal for scooter owners and mechanics who need a matched parts set to boost low-end performance on GY6 50cc 139QMB engines. The kit’s selling point is the combination of a larger bore, bigger valve and a full complement of parts, aimed at stronger hill-climbing and a straightforward rebuild. Considerable long-term value comes from reduced repeat repairs and the convenience of a complete overhaul package.
