TadaMark centrifugal go-kart clutch 3/4" bore 12T with #35 chain — fits 2–6.5 HP engines, includes chain & hardware

The TadaMark 12-tooth centrifugal clutch with a 3/4" (19.05mm) bore and included #35 chain is a ready-to-install drive solution for go-karts, minibikes and small engines rated 2–6.5 HP.

Built for makers and riders who need a compact, bolt-on clutch assembly, this unit combines a 12-tooth sprocket, a 4-foot #35 chain (130 links), and mounting hardware for a quick swap or upgrade. It engages at roughly 2300 ±300 RPM and matches most small-engine crankshafts with a 3/4" diameter and 3/16" keyway. The kit is supplied with the clutch, a pre-measured chain, a connecting link and set screws so you can tailor the chain length and secure the unit to your engine shaft.

Will this clutch fit my engine model?

This clutch is designed for engines with a 3/4" (19.05mm) crankshaft and a 3/16" keyway. It commonly fits many 2–6.5 HP engines across popular brands and common clone motors.

• Compatible engines: Honda GC160, GC190, GX120, GX140, GX160, GX200.
• Works with Tecumseh models and most Briggs & Stratton up to 6.5 HP with 3/4" shafts.
• Also fits Harbor Freight Greyhound 196cc and Predator 212cc, plus many 5.5–6.5 HP clones.
• Not compatible with 0.787" (20mm) bores—measure your shaft before ordering.

How does the clutch perform and when does it engage?

The centrifugal design delivers gradual engagement as engine speed rises so power is transferred smoothly to the chain drive. Expect engagement near the mid-range RPM suitable for most small-engine recreational vehicles.

• Engagement speed: approximately 2300 ±300 RPM for predictable take-up.
• 12-tooth sprocket mated to a #35 chain provides reliable torque transfer for light vehicle loads.
• Designed for engines rated between 2 and 6.5 horsepower.

What comes in the package and what adjustments will I need?

The kit ships with the clutch assembly and the chain pre-sized to four feet; you’ll receive small hardware to complete installation. Chain length and alignment adjustments are normally required during fitting.

• Included: one 12-tooth centrifugal clutch, one 4-foot #35 chain (130 links), one connecting link, two set screws.
• Trim the chain to suit your frame and sprocket spacing using a chain tool or grinder.
• Use the supplied set screws and keyway to secure the clutch to the crankshaft firmly.

Any tips for installation and first-time use?

Simple prep and a controlled break-in will extend life and ensure consistent operation. Lubrication at assembly and a short bedding-in period help the internal shoes seat correctly.

• Before fitting, apply a thin ring of lubricant around the circlip area and let it settle, then rotate the clutch to distribute lubricant.
• After installation perform 3–5 light break-in runs to allow the clutch shoes to bed without excessive slipping or heat.
• If the clutch slips and smokes during initial runs, reduce load and continue break-in to increase contact area.

Who is this for: The TadaMark 12T centrifugal clutch kit is aimed at hobbyists, fabricators and small-vehicle owners who need a dependable, off-the-shelf clutch for go-karts, minibikes, fun karts and DIY projects using common 2–6.5 HP engines with a 3/4" shaft. Measure your crankshaft bore and keyway first, and choose this kit if you want a compact, easily adjustable chain-drive solution that’s ready to install and tune.