SEHNSUCHT Gy6 50cc Clutch & Variator Kit for 139QMB Engines — 22-Spline Drum, 669 Belt Included

SEHNSUCHT Fit for Gy6 50cc Clutch Assembly Kit is a complete replacement clutch and variator package built for GY6 50cc (139QMB) 4-stroke scooters, including clutch bell, variator, centrifugal clutch pads and a 669 drive belt.

This all-in-one kit supplies the core transmission components you need to restore or upgrade the drivetrain of a Gy6 50cc scooter or ATV. Designed for direct fit on GY6 50cc 139QMB engines, the set combines stamped iron and machined aluminum construction with precision components so you can replace worn parts quickly and get back on the road.

Will this kit fit my GY6 50cc (139QMB) engine?

Yes — the components are intended for standard GY6 50cc 4-stroke 139QMB applications where the variator and clutch dimensions match factory sizing. Check your scooter’s clutch drum spline count and belt size to confirm compatibility before ordering.

• Clutch drum: 22 internal splines
• Spline area inner diameter: 12 mm
• Drum outer diameter: 115 mm; inner diameter: 105 mm
• Belt specification: 669 x 18.1 (included)

How durable and heat-resistant are the parts?

Key load-bearing pieces use iron for strength and aluminum where weight and heat dissipation matter, helping the assembly withstand normal riding stresses and heat from prolonged operation. That combination balances longevity with quick cooling for improved service life compared with lower-grade replacements.

• Clutch bell and drum: premium iron for toughness and wear-resistance
• Variator housing/components: aluminum to reduce heat buildup
• Manufactured tolerances matched to standard GY6 50cc dimensions

What’s included and what should I expect in the box?

The package contains everything required for a full clutch-and-variator replacement so you avoid buying multiple parts separately. It’s aimed at DIY mechanics and professional shops who need a straightforward swap.

• 1 x complete clutch assembly (with 22-spline drum)
• 1 x variator assembly (rollers 16 x 13 mm)
• 1 x 669 drive belt (669 x 18.1)
• Fitting specs included for verification before installation

How will this affect ride performance and maintenance?

Replacing worn clutch and variator parts restores consistent power transfer and can eliminate slipping or irregular acceleration caused by degraded components. While not a performance tuning kit, fresh parts help maintain peak efficiency of the stock CVT system.

• Improves throttle response and reduces belt slip
• Reduces vibration from worn clutch surfaces
• Makes future maintenance predictable with factory-style dimensions

Who this is for: This SEHNSUCHT clutch kit suits owners of GY6 50cc 139QMB scooters and small ATVs seeking a complete, ready-to-install replacement. It’s ideal for riders restoring a neglected machine, mechanics needing a dependable service kit, or anyone replacing a worn belt, rollers, or clutch drum with parts matched to standard Gy6 dimensions. If you’re unsure about fitment, compare the listed spline and belt measurements to your vehicle’s current components or consult your mechanic before purchasing.