TadaMark Centrifugal Clutch 3/4 inch 10T with #420 Chain — Fits Honda GX/Predator 2–6.5HP, Iron Body

TadaMark's 3/4" 10-tooth centrifugal clutch with a #420 chain is a drop-in replacement designed to transfer power from small horizontal-shaft engines to go-kart and minibike drivetrains.

If you're rebuilding or upgrading a small engine kart, minibike, or utility machine powered by 2–6.5 HP engines, this clutch assembly provides a compact, iron-bodied centrifugal solution built for compatibility with common aftermarket motors. It ships with a 96-link #420 chain and connecting link so you can install and test quickly. The unit fits engines with a 3/4" (19.05 mm) shaft and supports popular engine families including Honda GX/GC and many Briggs, Tecumseh, and Predator-style powerplants.

Will this clutch fit my engine and shaft size?

Check the shaft diameter and engine output before ordering: this clutch is made for a 3/4" (19.05 mm) straight shaft and works across many 2–6.5 HP horizontal-shaft engines. It is not compatible with generator shafts at 0.787" (20 mm) without modification.

• Compatible shaft: 3/4" (19.05 mm) straight shaft.
• Engine range: 2 to 6.5 HP small engines (Honda GX/GC series, Briggs variants, Tecumseh, Predator 212 commonly used).
• Not compatible with 0.787" (20 mm) generator-style shafts.
• Verify engine hub dimensions and keyway presence before installation.

How does the centrifugal clutch perform on karts and minibikes?

The clutch engages progressively as engine RPM rises, letting the engine idle while the drivetrain remains free. At higher revs the shoes expand outward to engage the drum and drive the chain; this is standard for go-kart and minibike centrifugal clutches and provides smooth starts without a manual clutch lever.

• 10-tooth sprocket interface for compact, direct drive installation.
• #40/#41/#420 chain pitch compatibility (12.7 mm / 0.5 in pitch for #40/#41/#420 equivalence).
• Progressive engagement reduces stalling on initial throttle application.
• Iron construction for durability and effective heat dissipation under load.

What’s included and what do I need for installation?

The kit arrives ready for a typical replacement: one centrifugal clutch, one 96-link #420 chain, and a connecting link. You’ll usually need basic hand tools, a proper key or set screws if your shaft requires them, and a brief break-in procedure to bed the clutch shoes.

• Included: clutch assembly, 96-link #420 chain, connecting link.
• Tools: socket set, Allen keys, torque wrench, locking compound if recommended.
• Break-in: 3–5 short runs under load to seat the shoes and avoid early slipping or smoke.
• Inspect sprocket centerline and chain alignment before full-speed testing.

How long will the clutch last and how do I maintain it?

Longevity depends on load, riding style, and maintenance. With proper alignment, correct engine selection, and a controlled break-in, the iron clutch and chain offer robust service life for recreational and light utility use. Avoid continuous overload and inspect regularly for wear.

• Perform visual checks for shoe wear, drum scoring, and chain stretch every 10–20 hours of use.
• Replace chain or connecting link if links stiffen or elongate beyond specs.
• Avoid heavy slipping after installation to prevent glazing or heat damage.
• Keep mounting hardware tight and re-check alignment after the first rides.

Who is this for: TadaMark's 3/4" 10T centrifugal clutch with #420 chain suits hobbyists, kart and minibike owners, and small equipment repairers who need a reliable, affordable replacement for 2–6.5 HP horizontal-shaft engines. It's ideal for DIY engine swaps, restoration projects, and anyone replacing a worn clutch on Honda GX/GC engines, Predator-style motors, or similarly sized Briggs and Tecumseh units—provided the engine shaft measures 3/4" (19.05 mm). If you're unsure about fit, measure your shaft and compare engine specs before purchase, or contact the seller for guidance.