GOOFIT
GY6 50cc Valve Kit with Springs & Stem Seals (64mm) for 139QMB Scooter ATV
GY6 50cc Valve Kit with Springs & Stem Seals (64mm) for 139QMB Scooter ATV
5.0 / 5.0
(1) 1 total reviews
Couldn't load pickup availability
Product Overview
Complete your top-end rebuild with this high-precision Intake and Exhaust Valve Kit. Designed specifically for the 4-stroke GY6 50cc (139QMB) engine, this set includes everything needed to refresh your cylinder head’s sealing and compression. These valves feature the standard 64mm length, ensuring a perfect fit for stock 50cc heads to restore engine responsiveness and efficiency.
Product Compatibility
This kit is designed for the GY6 50cc 139QMA / 139QMB engine platform.
| Vehicle Type | Popular Compatible Brands |
| Scooter / Moped | TaoTao, Roketa, Sunl, VIP Future Champion, Gator, Wolf |
| ATV / Quad | Peace Sports, Ice Bear, Kandi, Mountopz |
| Engine Model | 139QMB, 1P39QMB, 139QMA |
Critical Fitment Note: This kit fits valves with a 64mm length. It is NOT compatible with "Tall Head" engines that require 69mm valves. Please measure your old valves before ordering.
Specifications
| Feature | Intake Valve | Exhaust Valve |
| Length | 64mm (2.51") | 64mm (2.51") |
| Outer Diameter (OD) | 18.5mm (0.72") | 16mm (0.62") |
| Stem Shaft Diameter | 5mm (0.19") | 5mm (0.19") |
| Engine Cycle | 4-Stroke | 4-Stroke |
Key Features
- Complete Top-End Kit: Includes intake valve, exhaust valve, heavy-duty springs, and premium stem seals for a full head refresh.
- Precision Stem Seals: High-quality seals prevent oil from leaking into the combustion chamber, reducing blue smoke and carbon buildup.
- Heat-Resistant Alloy: Valves are constructed to withstand the high thermal stress of air-cooled 4-stroke engines.
- Restore Compression: Replaces pitted or bent valves to ensure a perfect seat against the cylinder head for maximum power.
- Standard OEM Specs: Manufactured to exact 139QMB dimensions for consistent timing and valve train performance.
Share
Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for This kit is designed for the GY6 50cc 139QMA / 139QMB engine platform.; Vehicle Type; Popular Compatible Brands; Scooter / Moped; TaoTao, Roketa, Sunl, VIP Future Champion, Gator, Wolf; ATV / Quad; Peace Sports, Ice Bear, Kandi, Mountopz. Key physical/spec details from the product data include Length: 64mm (2.51"), Outer Diameter (OD): 18.5mm (0.72"), Stem Shaft Diameter: 5mm (0.19"). Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this replacement part, also compare the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. This is especially important for GY6/Roketa/TaoTao GY6 models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this replacement part for machines outside the listed compatibility, or for units with different OEM numbers, dimensions, mounting points, connectors, or year-specific configurations. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. Recheck listed specs such as Length: 64mm (2.51"), Outer Diameter (OD): 18.5mm (0.72"), Stem Shaft Diameter: 5mm (0.19"). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
Me sirvieron bien