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GY6 50cc-100cc High Performance Racing Camshaft for 139QMB Engine
GY6 50cc-100cc High Performance Racing Camshaft for 139QMB Engine
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Product Overview
Take your small-displacement engine to the next level with this High Performance Racing Camshaft. Specifically engineered for GY6 50cc, 60cc, 80cc, and 100cc engines, this upgrade is a must-have for anyone installing a Big Bore Kit. By optimizing valve lift and duration, it allows your engine to breathe better, delivering significantly improved acceleration and higher top-end RPMs.
Product Compatibility
Optimized for the 139QMB/139QMA engine series, the standard 4-stroke power plant for small scooters and ATVs.
| Vehicle Type | Popular Compatible Brands & Models |
| Scooter / Moped | TaoTao, Jonway, Roketa, Wolf, VIP Future Champion, Kymco (50cc Models) |
| ATV / Go Kart | 50cc-100cc Chinese Quads, Kids Go Karts, 4-Stroke Pocket Bikes |
| Engine Series | GY6 50cc, 60cc, 80cc, 100cc (139QMB / 139QMA) |
| Fitment Note | Designed for 4-Stroke engines only; Includes premium "XS" bearings. |
Specifications
| Component | Metric Measurement | Imperial Measurement |
| Total Length | 69mm | 2.72" |
| Teeth Count | 34 Teeth (Lightweight Sprocket) | -- |
| Engine Platform | GY6 50cc - 100cc | -- |
| Bearing Type | High-Quality "XS" Dual Bearings | -- |
| Material | Hardened Alloy Steel / Aluminum Sprocket | -- |
Key Features
- Racing-Spec Performance: Optimized cam lobes provide increased valve lift, enhancing intake and exhaust flow for a noticeable boost in horsepower and torque.
- Lightweight Sprocket Design: Features a precision-engineered 34-teeth lightweight sprocket to reduce rotational mass, allowing for faster throttle response and quicker revving.
- Premium "XS" Bearings: Equipped with high-speed "XS" bearings that offer superior durability and smooth operation, even at sustained high RPMs.
- Big Bore Compatibility: The perfect companion for 80cc and 100cc upgrades, ensuring the valvetrain can keep up with increased displacement needs.
- Advanced Material Build: Constructed from high-strength materials to prevent lobe wear and ensure long-term timing accuracy in high-performance setups.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for Optimized for the 139QMB/139QMA engine series, the standard 4-stroke power plant for small scooters and ATVs.; Vehicle Type; Popular Compatible Brands & Models; Scooter / Moped; TaoTao, Jonway, Roketa, Wolf, VIP Future Champion, Kymco (50cc Models); ATV / Go Kart; 50cc-100cc Chinese Quads, Kids Go Karts, 4-Stroke Pocket Bikes. Key physical/spec details from the product data include Total Length: 69mm, Teeth Count: 34 Teeth (Lightweight Sprocket), 34 Teeth (Lightweight Sprocket). 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 Total Length: 69mm, Teeth Count: 34 Teeth (Lightweight Sprocket), 34 Teeth (Lightweight Sprocket). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.