GYMMEDS Centrifugal Clutch for Go-Kart 1" Bore 14-Tooth — Fits #40/#41/#420 Chain, 6.5–8HP (212cc) up to 2300 RPM

GYMMEDS 1" bore centrifugal clutch with a 14-tooth sprocket designed for #40/#41/#420 chains delivers reliable torque transfer for 6.5–8HP (212cc) small engines up to 2300 RPM.

This clutch is an engineered replacement part for small-engine applications such as go-karts, mini bikes, mini choppers, generators and light garden equipment. Built to match a standard 1" output shaft with keyway, the unit provides a compact, durable way to engage power without complex modifications. It ships ready-to-fit and includes mounting screws; chain is not included.

How does this centrifugal clutch engage and protect my engine?

The clutch uses centrifugal shoes that move outward as engine speed rises, engaging the sprocket and transmitting power once the engagement threshold is reached. That automatic action reduces stalls at idle and allows the engine to rev freely when disconnected from the load, improving usability and drivetrain longevity.

• Engagement threshold suitable for up to 2300 RPM operating speed.
• Centrifugal shoe design reduces shock loads during engagement.
• Automatic disconnect at low idle to prevent stalling and wear.

Which engines, shafts and chains is this clutch compatible with?

This clutch is made for engines that have a 1" diameter output shaft with a standard keyway and are typically found on 6.5–8HP, 212cc engines. It fits sprockets with 14 teeth and is optimized for #40, #41 and #420 roller chains. Always verify shaft diameter and keyway type before installation.

• 1" bore with a standard keyed shaft interface for secure mounting.
• 14-tooth sprocket profile matched to #40/#41/#420 chains.
• Common fit for 212cc small engine family (6.5–8HP range).

What materials and build details ensure durability and performance?

The clutch body and components are produced from high-impact, wear-resistant steel engineered for heat dissipation and sustained torque transfer. Lightweight yet strong construction minimizes rotational mass while maintaining resistance to wear under repeated engagement cycles.

• High-grade steel construction for impact and wear resistance.
• Design favors fast heat dissipation to reduce overheating risk.
• Precision-machined components for consistent engagement and long service life.

How easy is installation and what comes in the package?

Installation is straightforward for mechanically experienced users: slide the clutch onto the keyed 1" shaft, align, and secure using the included screws. The package contains the clutch and two mounting screws; a compatible chain and any necessary spacer or washer hardware must be sourced separately.

• Package includes 1 x 1" bore, 14-tooth clutch and 2 mounting screws.
• Requires a keyed 1" output shaft—measure before ordering.
• Chain and additional fasteners are not included; check clearance and alignment during fit-up.

Who is this for: This GYMMEDS centrifugal clutch is intended for DIY mechanics, kart builders, and small-equipment owners who need a dependable replacement or upgrade for 212cc (6.5–8HP) engines. It suits users who want a compact, automatic engagement solution for go-karts, minibikes, generators, mini choppers, garden tractors and snow throwers—provided the engine has a 1" keyed output shaft. If you’re uncertain about fitment, measure your crankshaft diameter and keyway before purchase or contact customer support for verification.