1PZ Centrifugal Clutch for 97cc Mini Bike — 11T #35 Sprocket, 5/8in Bore OEM Replacement

1PZ BA5-11T is a direct-replacement centrifugal clutch with an 11-tooth sprocket and 5/8" bore designed for 97cc / 2.8 HP mini bike engines using #35 chain.

This clutch assembly is built to swap into small recreational and utility engines — including many Baja, Motovox and generic 97cc mini bike setups — providing the standard 11-tooth sprocket and a 5/8" (0.625") bore so it connects to common shafts without machining. It’s a straightforward OEM-style replacement engineered to engage automatically at higher RPMs, so you regain drive to the rear sprocket on vehicles such as go-karts, mini choppers, and utility equipment.

Will this clutch fit my 97cc mini bike engine?

Compatibility depends mainly on shaft diameter, chain size and mounting style. This unit uses a 5/8" bore and an 11-tooth sprocket cut for #35 chain; if your engine shaft is 5/8" (or you use a compatible bushing) and your drivetrain uses #35 chain, it will typically fit as a direct replacement.

• 5/8" (0.625") internal bore — standard for many mini bike engines
• 11-tooth sprocket sized for #35 chain engagement
• Designed for ~97cc, 2.8 HP powerplants commonly found on mini bikes
• May require a key, washer or retaining clip consistent with your existing setup

How does this centrifugal clutch behave on startup and at speed?

The clutch is centrifugal: it remains disengaged at low RPMs so the engine can idle without driving the wheels, and it progressively engages as revs rise. That delivers smooth takeoff and automatic engagement without a manual clutch lever.

• Idle allows engine to run without moving the vehicle
• Progressive engagement reduces shock to chain and sprockets
• Auto-engage point depends on shoe weight and spring tension typical for 2.8 HP units
• Suitable for casual riding, light hauling, and a variety of garden equipment

What vehicles and equipment will this clutch work with?

Because of the common bore and sprocket specification, this clutch fits a wide range of small vehicles and machines. It’s frequently used in mini bikes, small go-karts, choppers, and several types of utility equipment that accept a centrifugal clutch with a 5/8" shaft bore and #35 chain sprocket.

• Mini bikes and mini motorcycles (97cc / 2.8 HP class)
• Go-karts, Sport Karts and mini choppers
• Lawn/garden machinery: mowers, pumps, log splitters and small tractors
• Replacement for select Baja DB30, Motovox MBX10/MBX11 and generic engines

What’s included and how do I install it?

The package contains one 11-tooth centrifugal clutch with a 5/8" bore in 1PZ packaging. Installation is generally bolt-on: slide onto the keyed shaft, secure with the shaft hardware, align the chain and tension properly, and double-check fasteners before use.

• Package: 1 x 11-tooth centrifugal clutch, 5/8" bore
• Typical install: shaft key, washer and retaining nut or clip required
• Verify chain alignment and tension to avoid premature wear
• Contact 1PZ support for fitment questions or troubleshooting

Who this is for: Riders, DIY mechanics and equipment owners who need a reliable, direct-replacement centrifugal clutch for a 97cc (about 2.8 HP) mini bike or similar small-engine machine will find this product useful. It’s intended for those seeking an OEM-style 11T #35 chain clutch with a 5/8" bore that fits common mini bike and small-utility applications without complex modifications. If you’re unsure about fitment, measure your shaft diameter and chain size or reach out to 1PZ customer service for guidance.