YOXUFA 48-Tooth 420 Chain Sprocket Hub for Predator 212/196cc – 1" Bore, 1/4" Keyway, Steel Replacement

YOXUFA 48-tooth 420 sprocket hub is a heavy-duty replacement designed to fit 1" bore axles with a 1/4" keyway for Predator 212cc and 196cc mini bikes, go-karts and similar powersports machines.

Built from solid steel, this assembled sprocket hub combines a 48-tooth #420 sprocket with a four-inch outer-diameter hub engineered for common small-engine drivetrains. The unit ships with a key, bolts and nuts for a straightforward swap and includes dimensional specs so you can confirm fitment before purchase. It’s intended as a direct replacement for many 6.5hp Predator-style engine applications and other 196cc–212cc platforms that use a 420 chain.

How do I confirm this sprocket will fit my go-kart or mini bike?

Measure three critical points: the axle bore, the bolt circle diameter (BCD), and the sprocket center hole. This YOXUFA hub has a 1" bore, 54mm center hole, and a bolt circle of 90mm (3.54"). If your engine and chassis match those numbers, the part should mount without modification.

• Axle bore: 1" (25.4mm)
• Key/keyway size: 1/4"
• Center hole diameter: 54mm (2.13")
• Bolt circle (center-to-center): 90mm (3.54")

What are the material and build details I should expect?

The sprocket and hub are manufactured from steel for strength and durability under regular recreational loads. Teeth are cut to suit #420 chain compatibility, and the assembly uses eight mounting holes and supplied fasteners to secure the sprocket to the hub.

• Sprocket: #420 chain, 48 teeth, overall diameter 197mm (7.76")
• Hub outer diameter: 4"; thickness: 6mm (0.236")
• Mounting holes: 8 × 10mm (0.39") diameter
• Included hardware: keyway, 4 screws, 4 nuts

How straightforward is installation and what tools will I need?

Installation is a routine mechanical job if your measurements match. You'll remove the old sprocket or pulley, slide the hub onto the axle, position the key in the keyway, and tighten the supplied fasteners to the hub’s bolt pattern. Use standard hand tools and basic torque checks to ensure a secure fit.

• Typical tools: socket set, torque wrench, breaker bar, pliers
• Procedure: remove old part → align keyway → mount hub → torque bolts
• Recommended: verify chain alignment and tension after install

What should I check for maintenance and safe use?

Regularly inspect the teeth for wear, confirm fasteners remain tight, and keep the chain lubricated to prolong life. Replace the sprocket if teeth become hooked or excessively thin to prevent premature chain failure.

• Inspect teeth and mounting bolts every few rides
• Keep #420 chain properly tensioned and lubricated
• Replace if gear teeth are deformed or mounting holes elongate

Who is this for: This YOXUFA 48T 420 sprocket hub is intended for DIY mechanics, kart builders, and powersports hobbyists running Predator-style 196cc or 212cc small engines or any application that requires a 420 chain with a 1" bore and 1/4" keyway. If you need a durable steel replacement that arrives with the key and mounting hardware, this kit simplifies the swap and gets you back on track quickly.