CILOYU Modified 420 Sprocket 40 Tooth 40mm Bore for CT200U

This heavy-duty aftermarket sprocket replaces worn or mismatched drive gears on a wide range of small off‑road and recreational engines. Built for 420-chain systems, the CILOYU sprocket expands compatibility by offering two mounting bolt circle patterns and additional mounting holes so it works with many Predator, Coleman, Baja, Hensim, Massimo and TrailMaster mini bike models. The design focuses on reliable power transfer, reduced chain wear and simple installation using the included hardware and master links.

Will this sprocket fit my mini bike or go-kart?

The sprocket is made to fit 420 chain drive systems and includes a 40 mm center bore. What makes it versatile are two bolt-circle options and extra mounting holes so it matches several engine and hub patterns used across popular mini bike lines.

• Fits 420 chain, 40 tooth count for common final drive ratios
• Center hole diameter: 1.57" (40 mm) for many hub shafts
• 6‑hole bolt circle: 1.93" (49 mm) center-to-center
• 4‑hole bolt circle: 3.15" (80 mm) center-to-center

How does this sprocket affect performance and wear?

This larger, reinforced sprocket improves torque delivery and climbing response when paired with appropriate gearing. Precision-cut teeth give smoother engagement which lowers spikes in chain stress and helps extend chain life under normal recreational use.

• 40T tooth profile tuned for consistent power transfer
• Precision-machined teeth reduce chain skip and friction
• Stronger plate design supports higher torque from larger small engines
• Includes extra master links to aid chain replacement and alignment

What hardware and accessories are included, and how simple is installation?

The kit arrives with all necessary fasteners and spare master links so you can replace the sprocket and reassemble the drive chain without hunting for parts. Installation is straightforward for anyone comfortable removing a wheel and working on a mini bike hub or engine sprocket.

• Package contents: 1× 420 40T sprocket, 5× 420 master link, 10× screws, 10× nuts
• Use the appropriate bolt pattern (4‑hole or 6‑hole) to match your hub
• Basic tools required: sockets, wrenches, chain breaker or pliers for master link
• Check chain tension and alignment after fitting for safest operation

Which engines and brands are known compatible with this part?

The CILOYU sprocket lists compatibility with many popular small-engine and mini bike platforms. Its multi-hole design was created specifically to cover both smaller and larger mini-bike engine mounts and aftermarket hubs.

• Predator 212cc, 196cc, 200cc and 6.5hp engine conversions
• Coleman Powersports CT200U, BT200X, CT100U, CC100X and similar models
• Baja Motorsports (MB165, MB200 series), Hensim MB165/MB200, Massimo MB200
• TrailMaster MB200 variants, Axis M200, Motovox, Monster Moto, Doodlebug lines

Who is this for? This sprocket is aimed at hobbyists, mechanics and small-vehicle owners who need a robust, multi‑pattern replacement for worn or mismatched 420-chain sprockets. If you run a mini bike, small go-kart or custom Predator-powered project and want a stronger final drive with flexible fitment options and all necessary hardware included, this kit provides a practical upgrade that simplifies installation and reduces drivetrain downtime.