YOXUFA 40T 420-Chain Mini Bike & Go-Kart Rear Sprocket — 40mm Bore, 80mm 4-Bolt BCD, Durable 420 Pitch

YOXUFA 40-tooth 420-chain sprocket with a 40mm center bore and 4-bolt 80mm bolt circle is a direct-replacement rear sprocket for many mini bikes and 196–212cc go-kart engines.

This heavy-duty sprocket is engineered to fit 420 pitch chains and several popular mini-bike and go-kart models, providing reliable power transfer and improved drivetrain longevity. It's cast and machined to the dimensions most commonly needed for Coleman, Baja, Massimo, TrailMaster, Axis and Predator-based machines. Before installing, confirm the 4-bolt mounting pattern and 40mm center bore match your hub to ensure compatibility.

Will this sprocket fit my Coleman BT200X or CT200U?

Yes, the YOXUFA sprocket is made to match the bolt pattern and bore used on many Coleman BT200X and CT200U variants, but it is not compatible with all Coleman models. Double-check your bike’s bolt circle diameter and center hole size before ordering.

• Bolt hole circle (BCD): 80 mm / 3-3/16" center-to-center
• Center bore diameter: 40 mm / 1-9/16"
• Tooth count: 40 teeth, 420 chain pitch
• Not compatible with B200R, RT200 or B212 models

How does this sprocket handle wear and chain retention?

The sprocket is manufactured from wear-resistant material and profiled for the 420 chain pitch, reducing the chance of chain derailment and extending component life under normal use. Proper installation and routine chain maintenance will further decrease premature wear.

• 420-pitch tooth profile matched to standard 420 chains
• Durable construction designed for abrasion resistance
• Precision machining for consistent tooth engagement
• Works best with correct chain tension and lubrication

Can I use this on a go-kart with a Predator or 196–212cc engine?

This sprocket suits many go-karts that accept a 40mm bore, 4-bolt 80mm BCD sprocket for 420 chains, including popular Predator 212 conversions and similar 196–200cc setups. Confirm your engine-to-rear-axle chain alignment and mount pattern before ordering to avoid fitment issues.

• Designed for small-engine go-kart and mini-bike drivetrains
• Typical applications include Predator 212 and 196cc-equipped karts
• Intended for rear-sprocket use, not front countershaft if bolt pattern mismatches
• Not suitable for #35 chain systems or non-420 pitch setups

What are the exact dimensions and mounting specifications?

The sprocket’s critical dimensions are provided so you can confirm compatibility visually or with a measuring tool. Using these specs prevents wasted returns and installation delays.

• Teeth: 40 (420 pitch)
• Overall diameter: 165 mm / 6-1/2"
• Center hole (bore): 40 mm / 1-9/16"
• Bolt hole circle (center-to-center): 80 mm / 3-3/16" (4-bolt pattern)

Who is this for: The YOXUFA 40T sprocket is ideal for DIY mechanics, mini-bike restorers, and go-kart builders who need a reliable 420-chain rear sprocket with a 40 mm bore and 4-bolt 80 mm BCD. Choose this part if your machine’s specifications match the listed dimensions and you want a cost-effective replacement that fits common Coleman, Baja, Massimo, TrailMaster, Axis, and Predator-based drivetrains. If your bike or kart uses a different chain pitch or bolt pattern, select a compatible sprocket to avoid improper fitment.