25H 136 Links Chain + 68 Tooth Sprocket CNCMOTOK for 49cc Pocket Bike

Description

Product Overview

The CNCMOTOK 25H chain and 68‑tooth rear sprocket form a complete drivetrain solution designed specifically for 49cc pocket bikes, mini sport motorcycles, and other small two‑stroke engines. The chain consists of 136 high‑strength links forged from a premium alloy that balances flexibility with durability. Each link undergoes a rigorous heat‑treatment process that creates a hardened surface, dramatically extending wear life even under the high‑torque demands of off‑road racing. The rear sprocket features 68 precisely machined teeth with an advanced tooth profile that maximizes engagement and minimizes slippage. Together, the chain and sprocket provide a seamless power transfer from the engine to the rear wheel, ensuring consistent acceleration and reliable performance in demanding environments.

Usage

This chain and sprocket kit is ideal for riders who push their pocket bikes on dirt tracks, motocross circuits, and rugged trail paths. The robust construction tolerates the shock loads generated by rapid acceleration, jumps, and tight cornering. Whether you are a competitive racer seeking a competitive edge or a hobbyist looking to upgrade a daily driver, the kit fits standard 136‑link chain dimensions and a 68‑tooth rear sprocket mounting pattern found on most 49cc models. Installation is straightforward: remove the old chain, align the new sprocket with the swingarm, and tension the chain according to the manufacturer’s specifications. Once installed, the drivetrain delivers smooth, quiet operation with reduced vibration, allowing you to focus on handling and speed.

Why Choose Us

Choosing CNCMOTOK means selecting a brand with a reputation for precision engineering and rigorous quality control. Every chain link is inspected for dimensional accuracy, and each sprocket tooth is measured to ensure concentricity within microns. Our manufacturing facilities employ computer‑controlled forging and CNC machining, guaranteeing repeatable results across every batch. In addition, CNCMOTOK provides a limited warranty and responsive customer support that assists with fitment questions, installation guidance, and after‑sales service. When you purchase this kit, you receive not only a high‑performance component but also the peace of mind that comes from a trusted supplier dedicated to rider safety and satisfaction.

Key Features

• High‑strength alloy chain with hardened surface for extended wear life.
• 68‑tooth precision‑forged sprocket delivers maximum power transfer.
• Designed for 49cc pocket bikes, ensuring a perfect fit and easy installation.
• Reduced vibration and noise for a smoother riding experience.
• Comprehensive warranty and dedicated customer support for peace of mind.

FAQ

What size chain does this kit replace?

The kit replaces a standard 136‑link chain commonly used on 49cc pocket bikes and mini sport motorcycles.

Is the sprocket compatible with all 68‑tooth rear wheels?

Yes, the sprocket follows the industry‑standard 68‑tooth mounting pattern, making it compatible with most rear wheels that accept a 68‑tooth configuration.

How do I properly tension the new chain?

After installing the sprocket, adjust the chain tension so that there is approximately 1/2 inch of vertical play at the midpoint of the chain’s longest span. Refer to your bike’s service manual for exact specifications.

Can I use this kit on a 2‑stroke engine only?

While the kit is optimized for 2‑stroke 49cc engines, it also performs well on comparable 4‑stroke models that use the same chain and sprocket dimensions.

What warranty does CNCMOTOK provide?

CNCMOTOK offers a limited one‑year warranty covering manufacturing defects, and our support team is available to assist with any fitment or performance concerns.