Go-Kart Torque Converter CVT Clutch 3/4 in TAV2 Replacement - Smooth

In this review the tester focused on the MOOSUN replacement 30 Series torque converter kit for go-karts and small machines, and the bottom line is simple: it is a practical, budget-minded way to upgrade a live-axle kart to smoother acceleration and better top-end speed. The reviewer found the kit to be a direct-fit substitute for Comet TAV2 units that accept a 3/4 in straight crankshaft, and highlighted the included dual sprockets and complete mounting hardware as the single biggest reason to buy if you need a ready-to-install replacement that covers both #35 and #40/41/420 chain setups.

Key Features

• Direct replacement: Fits Comet TAV2 models 218353A, 219552A, 219456A and 217610A so installation follows existing mounting points on most karts.
• 3/4 in shaft compatibility: Works with engines that have a 3/4 in straight crankshaft and covers common small engine sizes from 2 hp to 8 hp.
• Dual sprocket kit: Includes both a 12 tooth sprocket for #35 chain and a 10 tooth sprocket for #40/41/420 chain so you can adapt to different rear axle or chain standards.
• Belt and cover included: The kit ships with a drive belt (approx 27.76 in length), a plastic assembly cover and an aluminum mounting plate for a more complete installation than clutch-only replacements.
• 30 series asymmetrical design: The CVT clutch geometry is intended to reduce engine load and provide smoother takeoff and improved speed range compared with a simple centrifugal clutch.

Who It's For

This torque converter kit is aimed at do-it-yourself mechanics and kart owners running live-axle go-karts, mini-bikes, or other small machines that use a TAV2 style torque converter and a 3/4 in shaft. It is particularly useful when rear tires are larger than 16 in and a centrifugal clutch cannot reliably deliver the required traction or speed range.

Those who should look elsewhere include riders needing a sealed OEM Comet unit by original manufacturer branding or people with crankshafts that are not 3/4 in straight shafts. Also, users requiring a clutch tuned for engines above 8 hp should consider a unit rated for higher power.

Pros & Cons

Pros

• Complete kit with belt, cover, mounting plate and both sprockets simplifies replacement and reduces parts sourcing time.
• Direct-fit compatibility with common Comet TAV2 part numbers makes installation straightforward on many machines.
• Improves acceleration and allows higher speeds from small engines by reducing engine load compared with a centrifugal clutch.

Cons

• Not manufactured by the original Comet brand, so buyers seeking OEM labeling should be aware this is an aftermarket reproduction.
• Limited to engines roughly 2 hp to 8 hp and a 3/4 in straight crankshaft, so it will not suit larger engines or other shaft sizes.

Specifications

Our Verdict

The MOOSUN 30 Series 3/4 in torque converter kit is a sensible aftermarket replacement for TAV2 go-kart setups that need smoother acceleration and more usable top speed than a centrifugal clutch provides. It delivers strong practical value thanks to the included sprockets, belt and mounting hardware, and fits the common 2 hp to 8 hp engines used on many karts. Buy this if you need a complete, direct-fit CVT swap and are comfortable with an aftermarket reproduction rather than an OEM-branded unit.

Frequently Asked Questions

Will this fit my engine?
This fits engines with a 3/4 in straight crankshaft and is intended for engines from about 2 hp to 8 hp.

Does the kit include sprockets for different chains?
Yes, it includes a 12 tooth sprocket for #35 chain and a 10 tooth sprocket for #40/41/420 chain; chain is not included.

Is this the original Comet part?
No, this is an aftermarket reproduction that is compatible with Comet TAV2 units but not manufactured by Comet.