Automotive replacement part designed to restore compression and reliability in small GY6 engines. Peace of mind for owners wanting a straightforward engine refresh. Is the GOOFIT Cylinder Head the right fit for a 49cc or 50cc GY6 scooter or moped?
⚡ At a Glance
- • Valve Dimensions: Intake valve 18.6 mm, exhaust valve 16 mm
- • Best for: Owners of 4-stroke GY6 49cc and 50cc scooters and mopeds seeking engine restoration
- • Not ideal for: Engines with different valve dimensions or non-GY6 specifications
Brand new cylinder head supplied with valves and seals pre-installed. Designed for 4-stroke GY6 49cc/50cc engines and may suit some 100cc large-diameter applications.
Restore compression and responsiveness - with pre-installed valves and seals
Valves and valve seals arrive fitted at the factory, matching the stated intake and exhaust diameters. Precision manufacturing helps maintain valve seat alignment and sealing performance.
Improved compression translates to quicker throttle response and smoother idling, matching many user reports of engines running like new. Suitable for routine rebuilds where valve wear has reduced performance.
Straightforward fitment for common GY6 engines - with compatibility for 139QMA/139QMB codes
Compatibility is specified for 4-stroke GY6 49cc and 50cc scooters and mopeds, with explicit reference to 139QMA and 139QMB engine types. Installation advice and size pictures are supplied to confirm fitment.
Quick replacement for owners familiar with GY6 engine swaps, reducing the need for machining or modification. Reading the installation information ensures correct selection before purchase.
Durable replacement for everyday use - with precision manufacturing and long service life
Manufacturing notes describe stable performance and long service life, indicating quality control during production. Brand new condition reduces risks associated with used or reconditioned heads.
Reliable construction lowers the chance of early failure and helps extend intervals between major engine work. Positive user feedback highlights dependable quality and excellent value.
✨ The 4 Key Reasons for GOOFIT Cylinder Head
- Pre-fitted valves — Cuts assembly time, ready for immediate head replacement
- Specified valve diameters — Ensures correct sealing and compression for specified GY6 engines
- 139QMA/139QMB compatibility — Designed for common GY6 engine codes, reducing custom modifications
- Seller support available — Seller offers pre- and post-purchase support for fitment queries
📋 Technical Details at a Glance
- Category: Cylinder head replacement
- Application: 4-stroke GY6 engines
- Compatible engines: 49cc, 50cc scooters and mopeds, some ATVs
- Engine codes: 139QMA, 139QMB
- Intake valve diameter: 18.6 mm
❓ Frequently Asked Questions
Q: Will this cylinder head fit my GY6 50cc scooter?
A: Suitable for 4-stroke GY6 49cc and 50cc scooters and mopeds; check the installation information and picture sizes to confirm fit for your specific model.
Q: Are valves and seals already installed?
A: Valves and valve seals are supplied installed on the cylinder head according to the product description.
Q: Can it be used on a 100cc engine?
A: Description notes compatibility with some 100cc large cylinder diameters, but confirm dimensions and fitment or contact the seller for clarification.
🏆 Our Verdict
Best suited for owners of GY6 49cc and 50cc scooters who need a reliable cylinder head replacement. Pre-installed valves and clear valve dimensions simplify installation and help restore engine performance. Offers solid long-term value by restoring compression and reducing the need for frequent repairs.
