Honda CRF125 F Chain Kit Chain Boss 428 FrontRear Sprocket 112 Link

Description

Product Overview

The Chain Boss 428 kit is engineered specifically for Honda CRF125 F motorcycles spanning model years 2004 through 2025. This comprehensive package includes both front and rear 428‑tooth sprockets and a matching 112‑link chain, delivering a complete solution that restores original performance specifications. Each component is fabricated from high‑grade steel with a natural finish that resists corrosion while maintaining the classic look of the original equipment. The kit adheres to the OEM chain pitch of 420 and the OEM gearing ratio of 13:46, ensuring seamless power delivery from the engine to the rear wheel. With a total weight of just 4.75 pounds, the kit is lightweight yet robust, offering the durability required for demanding off‑road conditions. The included master link features a clip‑type design for quick, tool‑free installation, simplifying the replacement process for both professional mechanics and DIY enthusiasts.

Usage

This kit is ideal for riders who demand reliable chain performance on rugged terrain, whether navigating tight forest trails, tackling desert dunes, or competing in motocross events. The 428‑tooth sprockets provide a balanced gear ratio that enhances acceleration without sacrificing top‑end speed, making the bike responsive in both low‑speed technical sections and high‑speed straightaways. The 112‑link chain length is calibrated to fit the CRF125 F’s swingarm geometry, eliminating the need for additional adjustments or custom link additions. Because the components are designed to match the factory specifications, the kit integrates seamlessly with existing drivetrain parts, reducing the risk of premature wear. Riders who regularly replace their chain due to heavy use will appreciate the extended service life offered by the hardened steel construction, which resists stretching and wear even under extreme loads.

Why Choose Us

Choosing the Chain Boss 428 kit means selecting a product backed by a reputation for precision engineering and rigorous quality control. Each sprocket undergoes a heat‑treatment process that enhances hardness while preserving the tooth profile, ensuring consistent engagement with the chain under all conditions. The chain itself is tested for tensile strength and flexibility, meeting or exceeding OEM standards. Our manufacturing facilities employ advanced CNC machining to guarantee tight tolerances, which translates to smoother operation and reduced vibration. In addition to the superior hardware, Chain Boss provides dedicated customer support, offering installation guidance, troubleshooting assistance, and a warranty that covers manufacturing defects. This commitment to after‑sales service gives riders confidence that their investment is protected and that any issues will be addressed promptly.

Key Features

• Complete front and rear 428‑tooth sprockets deliver OEM‑matched gearing for optimal power transfer.
• Durable 112‑link chain with 420 pitch ensures a perfect fit and long service life on demanding terrain.
• Natural‑finish steel components resist corrosion while maintaining a classic appearance.
• Easy clip‑type master link allows quick, tool‑free installation for both professionals and DIY riders.
• Comprehensive warranty and responsive customer support provide peace of mind after purchase.

FAQ

Is this kit compatible with all model years of the Honda CRF125 F?

Yes, the kit is designed to fit Honda CRF125 F motorcycles from the 2004 model year through the 2025 model year, covering the full range of production variations.

Do I need any special tools to install the kit?

No special tools are required. The included clip‑type master link allows you to install the chain without additional hardware, and the sprockets bolt directly onto the existing mounting points using standard socket wrenches.

How does the 428‑tooth sprocket affect performance compared to the original?

The 428‑tooth sprocket maintains the factory‑specified gear ratio of 13:46, preserving the bike’s intended acceleration and top‑speed characteristics while providing improved durability over stock components.

What maintenance is recommended after installing the kit?

We recommend regular cleaning and lubrication of the chain, checking chain tension every 200 miles, and inspecting sprocket teeth for wear during routine service intervals to ensure optimal performance.

Can I replace only the chain or only the sprockets if needed?

Yes, the kit is modular. You can purchase the chain or sprockets separately if you only need to replace one component, but installing the full kit together ensures the best match and performance.