40 Series Heavy-Duty Torque Converter Kit – 8HP to 16HP

40 Series Heavy-Duty Torque Converter Kit

The 40 Series Torque Converter is a heavy-duty automatic CVT transmission system designed for larger go-karts, buggies, ATVs and utility vehicles.

Unlike a conventional centrifugal clutch, the torque converter automatically adjusts its drive ratio according to engine speed and vehicle load. This provides stronger low-speed pulling power, smoother acceleration and more efficient power delivery across the operating range.

It is suitable for compatible 8HP–16HP four-stroke engines fitted with a 1-inch straight crankshaft and ¼-inch keyway.

Key Features

• Suitable for compatible 8HP–16HP four-stroke engines
• Smooth automatic CVT operation
• Approximately 2.43:1 low-speed reduction ratio
• Approximately 1:1 high-speed ratio
• Improved pulling power at lower speeds
• Smooth and progressive acceleration
• Heavy-duty steel pulley construction
• Symmetrical ⅞-inch torque-converter belt
• Suitable for demanding recreational and utility applications
• Replacement option for many Comet 40 Series-style systems

Specifications

• Series: 40 Series
• Recommended engine output: 8HP–16HP
• Driver bore: 1 inch / 25.4 mm
• Driver keyway: ¼ inch / 6.35 mm
• Driven pulley diameter: Approximately 7½ inches / 190 mm
• Driven bore: ¾ inch / 19.05 mm
• Driven keyway: Approximately 3/16 inch / 4.76 mm
• Belt type: Symmetrical CVT belt
• Belt width: Approximately ⅞ inch / 22–23 mm
• Low ratio: Approximately 2.43:1
• High ratio: Approximately 1:1
• Typical engagement range: Approximately 1,600–2,600 rpm
• Material: Heavy-duty stamped steel

Suitable Applications

• Adult go-karts
• Off-road buggies
• Drift trikes
• ATVs
• Utility vehicles
• Custom recreational vehicle projects
• Agricultural and industrial equipment

Package Contents

• 40 Series driver clutch
• 40 Series driven pulley
• Heavy-duty symmetrical drive belt
• Mounting components as pictured

Important Compatibility Information

Please check your engine shaft diameter, keyway size, driven-shaft diameter, pulley alignment and required belt length before ordering.

This is not a direct replacement for every go-kart or buggy. Some applications may require fabrication, spacers, a mounting plate or modification to the existing jackshaft arrangement.

Professional installation is recommended. Incorrect pulley alignment or use of the wrong belt length can cause premature belt and clutch failure.