Product Details
Description
Universal Parts Type-3 Pocket Bike Gearbox Transmission
Key Details
- 157-8
Specifications
- Height: 57mm Uses T8F or BF05T chain 47cc/49cc Cag Pocket Bikes
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 49cc
- Fitment Notes: Universal Fit, Pocket Bike
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Is this for 49cc scooters?
A: This SKU is listed with 49cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 0.8 lbs |
|---|---|
| Dimensions | 6 × 4 × 2.1 in |
Restore the snap and reliability of your drivetrain with the Universal Parts Type-3 Gearbox Transmission. Specifically engineered for 47cc and 49cc air-cooled 2-stroke engines, this "Cag-style" transmission acts as a direct-fit replacement for worn or grinding factory gearboxes. Whether you're refreshing a pit bike or building a custom pocket quad, this gearbox ensures your engine's torque is efficiently delivered to the ground with minimal friction and maximum durability.
Key Performance Features
- Optimized 6-Tooth Sprocket: Pre-installed with a high-tensile 6-tooth drive sprocket, perfect for maintaining high-end speed on small-displacement racing engines.
- Chain Compatibility: Fully compatible with T8F / BF05T chain standards, the most common sizes for import pocket bikes and quads.
- Precision 78mm Clutch Drum: Features a balanced internal drum design that matches standard 3-shoe centrifugal clutches for smooth engagement and reduced heat build-up.
- Direct Bolt-On Fit: Designed as a "drop-in" assembly with standard mounting patterns, requiring zero modifications to your Cag or Daytona-style frame.
Comprehensive Fitment Guide
This Type-3 Gearbox is a direct replacement for 47cc and 49cc 2-Stroke engines used in:
| Vehicle Category | Common Compatible Styles |
|---|---|
| Pocket Bikes | Cagllari CAG, Daytona, MTA1, MTA2, Lucky 7 |
| Pocket Quads / ATVs | 47cc / 49cc Mini Quads & Dirt Bikes |
| Go-Karts | Small-frame 2-stroke "Stand-up" Goped-style karts |
Technical Specifications
- Type: Type-3 Gearbox Transmission
- Sprocket Size: 6-Tooth
- Clutch Drum ID: 78mm
- Overall Height: 57mm
- Material: Cast Aluminum Housing / Steel Internals
- Chain Size: T8F or BF05T
 Installation Tip: When installing, ensure your chain tension has roughly 1/2 inch of "play" to prevent premature wear on the gearbox output shaft bearings.Â
About Universal Parts
Universal Parts is a comprehensive line of quality, affordable replacement parts for Chinese-made scooters, pocket bikes, and ATVs. From basic consumables to complete drivetrain assemblies, Universal Parts offers reliable solutions to keep your ride running.





