CILOYU 420 Chain 40T Sprocket, 40mm Replacement for Coleman BT200X CT200U-EX CT200U, CT100U, Baja MB165/MB200, Predator 212/196cc – 90+42 Links

Overview

The CILOYU 420 chain 40T sprocket serves as a durable, direct replacement for a wide range of small-engine rides. With a 40 mm center bore and a 40-tooth profile, this sprocket is designed to work smoothly with a 420 chain, delivering steady power transfer across everyday use and weekend sessions. The finish and the machining work together to present a rugged, ready-for-action look on your drive train.

Key benefits

• Broader fitment thanks to a six-extra-hole pattern plus four outer mounting holes for select models, enabling installation on more frames.
• Smoothed power transmission from precision-machined teeth that engage the chain consistently, with a potential reduction in chain wear over time.
• Larger sprocket size designed to support stronger acceleration, better climbing torque, and steadier pull across varied terrain.
• 40-tooth configuration paired with a robust 40 mm center bore for dependable mounting and reliable operation under load.

Compatibility and install notes

This sprocket is built to work with a variety of models, including Predator 212cc and 196cc engines, Coleman BT200X and CT200U family, CT100U CC100X, Baja MB165/MB200, Doodlebug DB30, Hensim, MASSIMO MB200, TrailMaster and Axis M200 lines. The note about mounting holes means the middle hole location helps determine model compatibility; the four outer holes support installations on specific mini bikes such as CT200U and BT200X, while the additional six holes broaden potential fits for other 420-chain platforms. Always verify fitment against your frame’s mounting pattern before installation.

What’s included

• 1 × 40T 420 chain sprocket
• 1 × 420 chain 90 links
• 1 × 420 chain 42 links
• 5 × 420 master links
• 10 × screws
• 10 × nuts
• 1 × 420 sprocket 10T
• 1 × 3/16" keyway
• 1 × chain breaker

Specifications at a glance

• Teeth: 40
• Center hole diameter: 40 mm
• Mounting distances: 49 mm (center to center) and 80 mm (center to center)
• Bolt hole circle: 49 mm (six inner holes) plus four outer holes for select installations

When upgrading, consider this kit as a balanced option between size, compatibility, and included hardware. Results will vary with model and riding conditions, and installation should be performed with proper safety precautions.