6-Tooth 25H Clutch Drum Gearbox Assembly for 2-Stroke 47cc 49cc Pocket Bike

Product Overview

Maximize your top-end velocity with this 6-Tooth 25H Clutch Drum Gearbox. Specifically engineered for 47cc and 49cc 2-stroke mini engines, this small-format gearbox is designed to help your engine achieve higher speeds and smoother acceleration curves. By replacing your standard housing with this precision-manufactured 6T unit, you ensure a more efficient transfer of power from the centrifugal clutch to the drive chain, making it an essential upgrade for pocket bike enthusiasts and mini-moto racers.

Product Compatibility

Component	Specification
Engine Type	2-Stroke Air-Cooled (47cc / 49cc)
Chain Size	25H Chain
Sprocket Teeth	6T (6-Teeth)
Segment Spacing (Pitch)	6.3mm (0.24")
Common Models	MTA1, MTA2, Cagllari, Mini Pocket Dirt Bikes, Quads

Specifications

Feature	Details
Gearbox Type	Small 6-Tooth Clutch Drum
Chain Pitch	6.3mm (0.24")
Compatibility	25H High-Strength Chain
Material	High-Grade Corrosion-Resistant Alloy
Performance	High-Speed Optimized

Key Features

• High-Speed Gear Ratio: The 6-tooth configuration is specifically tuned to allow small-displacement engines to reach higher top speeds while maintaining a smooth, linear acceleration profile.
• Precision 25H Alignment: Features a 6.3mm segment spacing (pitch) perfectly matched for 25H chains, reducing friction and preventing chain binding during high-RPM operation.
• Durable Alloy Construction: Made from high-quality, corrosion-resistant materials, this gearbox is built to withstand the intense heat and vibration of 2-stroke racing without warping or rusting.
• Stable Performance: Precision manufacturing ensures the clutch drum is perfectly balanced, providing consistent contact with the clutch pads for a stable, "no-slip" drive experience.
• Direct Replacement Fit: Designed as a drop-in replacement for standard 47cc/49cc small gearboxes, making it a quick and effective performance upgrade for your mini-moto drivetrain.