CILOYU 60T 420 Sprocket Kit with 90-Link Chain for CT200U — 40mm Bore, Torque-Boosting Upgrade

CILOYU's 60-tooth 420 sprocket kit with a 90-link chain is a direct-fit upgrade that boosts low-end torque and improves traction for CT200U and similar mini bike models.

This complete drivetrain kit replaces the standard 50T sprocket and includes sprockets, chains, master links, fasteners, and installation tools so you can swap components without sourcing extra parts. Built for popular mini bikes and dirt-bikes—Coleman CT200U, Baja models, Motovox, Monster Moto and others—this package focuses on stronger starts, more controlled low-speed riding and better hill-climbing capability.

How does the 60-tooth sprocket change performance on my mini bike?

Going from a 50T to a 60T rear sprocket increases mechanical advantage at the wheel, producing noticeably more torque and slower top speed. That means quicker, more confident takeoffs, improved traction on loose surfaces, and easier climbing while carrying weight.

• Greater wheel torque for stronger starts and hill climbs
• Reduced need to rev the engine for low-speed maneuvers
• Less wheel spin on mud, sand, or loose gravel

Which models and parts does this kit fit?

This kit was designed for a wide range of mini bikes and small ATVs using a 420 chain system. It’s compatible with multiple Coleman, Baja, Motovox, Monster Moto and similar models, but you should confirm bore and fitment before installing.

• 40mm bore 60T rear sprocket—confirm wheel hub diameter matches
• Compatible models include Coleman CT200U/BT200X/CT100U, Baja MB165/MB200/DB30 series
• Also fits Motovox MBX10/MBX11 and Monster Moto MMB80/MMB105 variants

What comes in the box and what tools are included?

The kit arrives as a comprehensive set so you don’t need to hunt for small parts. It includes both chains and mounting hardware, plus a chain breaker to size the chain during installation.

• 1 x 60T 420 rear sprocket (40mm bore) and 1 x 10T 420 front sprocket
• 1 x 420 chain (90 links), 1 x 420 chain (42 links), 5 master links
• 10 screws, 10 nuts, 3/16" keyway and a chain breaker tool

Will this affect top speed or engine wear?

Installing a larger rear sprocket reduces top speed while increasing torque at the wheel—this trade-off improves low-speed control and towing/loaded performance. Proper installation and regular chain maintenance are important to avoid premature wear; use correct tension and lubrication.

• Lowered top speed but stronger acceleration and pulling power
• Requires routine chain tension checks and lubrication
• Use the supplied keyway and fasteners for secure mounting

Who is this kit best suited for? Riders who want better low-speed control, frequent hill climbers, casual off-road users and owners of compatible Coleman, Baja, Motovox or Monster Moto mini bikes will get the most benefit. If you regularly encounter muddy trails, sandy beaches, or carry loads, the extra torque and the included installation parts make this CILOYU kit a practical, ready-to-fit drivetrain upgrade. Ensure your bike’s sprocket bore and chain specification match before purchasing to guarantee proper fitment.