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T8F 11-Tooth Transmission Gearbox (Double Chain) for 33cc–49cc 2-Stroke Mini ATV & Pocket Bike
T8F 11-Tooth Transmission Gearbox (Double Chain) for 33cc–49cc 2-Stroke Mini ATV & Pocket Bike
5.0 / 5.0
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Product Overview
Upgrade your mini-motor’s drivetrain with the Heavy-Duty T8F Double Chain Gearbox. Unlike standard single-chain units, this double-chain (twin belt/chain internal) design provides superior torque handling and smoother power distribution for 33cc to 49cc 2-stroke engines. Featuring a precision 11-tooth sprocket, this gearbox is engineered to maximize acceleration and deliver a more responsive throttle feel. The compact aluminum housing is built to withstand the high RPMs of pocket bikes and mini-quads, ensuring a reliable connection between your engine's clutch and the drive chain.
Product Compatibility
| Component Type | Specification |
| Engine Type | 2-Stroke (Air-Cooled) |
| Displacement | 33cc, 34cc, 47cc, 49cc |
| Chain Type | T8F Only (8mm pitch) |
| Vehicle Types | Pocket Bikes, Mini Dirt Bikes, Mini ATVs, Buggies, Go-Karts |
| Internal Design | Double Chain (Reinforced Drive) |
Specifications
| Feature | Details |
| Tooth Count | 11-Tooth Sprocket |
| Gearbox Style | Double Chain Internal Reduction |
| Total Length | 17.3cm (6.81") |
| Mounting Hole Pitch | 70mm (2.75") center-to-center |
| Material | High-Grade Aluminum Alloy |
Key Features
- Double Chain Internal Drive: Engineered with a double-chain internal mechanism to provide increased strength and smoother power transfer compared to standard single-chain gearboxes.
- Optimized Torque & Acceleration: The 11-tooth sprocket is specifically geared to help small 2-stroke engines reach higher speeds quickly while maintaining smooth, consistent acceleration.
- Lightweight Aluminum Housing: Constructed from a durable aluminum alloy that effectively dissipates heat and resists corrosion without adding unnecessary weight to your mini-bike.
- Precision T8F Fitment: Designed for exclusive use with T8F (8mm) chains, ensuring a perfect "bite" that prevents chain jumping and reduces mechanical noise during high-speed operation.
- Universal 70mm Mounting: Features the standard 70mm bolt pattern used on most Chinese-manufactured 2-stroke "Pocket Rocket" style engines for a quick, bolt-on installation.
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Fitment FAQ
Will this part fit my specific model and year?
This gearbox assembly is intended for 33cc–49cc 2-Stroke Mini ATV & Pocket Bike. Key physical/spec details from the product data include Tooth Count: 11-Tooth Sprocket, 11-Tooth Sprocket, Total Length: 17.3cm (6.81"). 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 gearbox assembly, also compare the chain size, tooth count, shaft diameter, case style, sprocket alignment, and 2-stroke/4-stroke engine type.
What models or situations does this part not fit?
Do not order this gearbox assembly for machines outside the listed compatibility, or for units with different chain sizes, shaft diameters, tooth counts, sprocket alignment, or case styles. 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 chain size, tooth count, shaft diameter, case style, sprocket alignment, and 2-stroke/4-stroke engine type. Recheck listed specs such as Tooth Count: 11-Tooth Sprocket, 11-Tooth Sprocket, Total Length: 17.3cm (6.81"). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
Works great