GY6 Super Performance CVT Transmission Kit - Rolling Wrench

This is our curated Rolling Wrench CVT transmission kit for the GY6 150cc QMJ157 — built after years of mixing, matching, and testing components from different vendors. Some parts come from China, some from Taiwan, but everything was selected with performance, reliability, and price in mind.

Most CVT kits on the market ship disassembled and require special tools to put together correctly. We handled all of that for you. The rear pulley assembly is fully built, the clutch and contra spring are already installed, and the variator is ready to go. Just bolt everything up and ride.

What makes this kit solid:
• High-quality adjustable steel rear pulley (stronger and smoother than stock)
• Contra spring + clutch pre-installed
• Lightweight performance clutch bell
• Complete variator with 11g rollers
• Choose your CNC lightweight drive face fan: red, green, gold, or blue

You’ll reuse your stock variator boss, washers, and nuts — everything else is included. You can also add a belt to the kit if you want the full 100% refresh (belt is optional and not included by default).

For the price, this setup is honestly tough to beat. It’s been a super reliable combo in all our in-house testing.

• Designed for **GY6 150cc QMJ157 engines** only.
• Belt is **not included** — add it if you want a fully refreshed CVT setup.
• You’ll reuse your stock variator boss, nut, and washer.
• The drive face fan color is up to you — all options function the same.
• Since the clutch and pulley arrive fully assembled, no specialty tools are required.

If you want help choosing roller weights or dialing in your CVT for your riding style, just ask — we’ve tuned more GY6 CVTs than we can count.