CILOYU 40 Tooth Sprocket 420 Chain 40mm Bore for CT200U

CILOYU's 40-tooth 420 sprocket is a direct-fit replacement designed for mini bikes and go-karts with a 40mm center bore, offering improved torque and durable power transfer for Predator, Coleman, Baja and similar engines.

This sprocket kit is engineered to match a wide range of 420-chain mini bike drivetrains, with two common mounting bolt patterns and extra mounting holes to fit more models without modification. It ships as a complete kit — sprocket, master links and hardware — so you can replace a worn part quickly and get back on the trail or track. The larger tooth count and precision-machined teeth are intended to deliver smoother chain engagement and longer chain life under load.

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

The sprocket supports 420 chain systems and features a 40mm center bore. It includes two mounting bolt-circle options (49 mm and 80 mm) and extra mounting holes to cover multiple models, increasing compatibility across popular mini-bike brands.

• Center bore: 1.57" (40 mm)
• 6-hole bolt circle: 1.93" (49 mm)
• 4-hole bolt circle: 3.15" (80 mm)
• Designed for Predator, Coleman, Baja, Hensim, Massimo and similar mini-bike engines

How does the 40-tooth sprocket affect performance on trails and hills?

With 40 teeth the sprocket increases torque and climbing ability compared with smaller sprockets while keeping chain speed manageable. The larger diameter raises mechanical advantage for acceleration and hill climbing without drastic changes to top speed in most setups.

• More teeth = improved low-end torque for hills
• Precision teeth reduce slippage and vibration
• Fatigue-resistant design helps extend chain life

What comes in the kit and how easy is installation?

The package contains the sprocket plus hardware needed to install it on compatible mini bikes. Included mounting bolts, nuts and master links let you swap the sprocket quickly; basic hand tools and standard mechanical skills are all that’s required.

• Includes: 1 x 40T 420 sprocket, 5 x 420 master links
• Also includes: 10 screws and 10 nuts for mounting flexibility
• Installation: remove old sprocket, align chosen bolt pattern, secure with supplied hardware

Which models are known to be compatible with this sprocket?

This sprocket is made to fit many popular mini bikes and go-karts that use 420 chain; the extra holes allow fitting both smaller- and larger-bore crank hubs. Check your mounting bolt circle and center-bore dimensions before ordering to confirm compatibility.

• Works with: Coleman CT200U, BT200X, CT100U, CC100X
• Compatible with: Predator 212cc/196cc/200cc engines, Hensim and Baja mini-bike models
• Also fits: TrailMaster, Massimo, Motovox, Monster Moto and similar 420-chain machines

Who is this for: This CILOYU 40T 420 sprocket suits riders and mechanics who need a reliable replacement or upgrade for mini bikes and compact go-karts using 420 chain. It’s aimed at owners of Predator-powered machines and mainstream mini-bike brands who want stronger acceleration and lower chain wear, plus DIYers who prefer a kit that includes all mounting hardware.