RDLN Racing Clutch Kit w/ Adjustable Sheave Pulley - 139QMB

Upgrade your entire rear CVT driven assembly with the RDLN Racing Clutch Kit with Adjustable Sheave Pulley for 139QMB and GY6 50cc engines. This complete kit replaces the stock clutch with a performance-engineered unit designed for rapid, reliable engagement and customizable acceleration tuning.

Includes three components: the clutch shoe assembly with red reinforced friction plates and 1500rpm engagement springs; the red anodized vented clutch bell/drum with large tapered vents and splined center bore; and the adjustable six-groove sheave pulley (three straight ramps for quicker off-the-line takeoff, three curved ramps for higher top speed). Cross-drilled holes and tapered vents on the outer drive face enhance heat dissipation under hard use.

Specifications

• SKU: 1200-1275
• Brand: RDLN
• Clutch Spring Tension: 1500rpm engagement
• Clutch Bell Inner Diameter: 107mm
• Clutch Bell Outer Diameter: 117mm
• Clutch Bell Splines: 22 splines, 11.2mm inner diameter (peak to peak)
• Clutch Shoe Inner Diameter: 24mm (flat to flat) / 28mm (round to round)
• Clutch Shoe Outer Diameter: 105mm
• Clutch Shoe Height: 30mm
• Sheave Outer Diameter: 118mm
• Sheave Ramp Grooves: 6 total — 3 straight (quick takeoff) + 3 curved (top speed)
• Origin: Taiwan
• Includes: Clutch shoe assembly, vented clutch bell/drum, adjustable sheave pulley

Compatibility — 139QMB-Based Engine Codes

If your 50cc-100cc engine code contains "QM" or "FM" it is likely compatible with this kit.

Off-road use only. Not intended for use on public roads. Not legal for use in California on pollution-controlled vehicles. Check local laws before installing. Performance upgrades are considered racing parts and are not covered by warranty.

• Complete Kit: Clutch Shoe Assembly + Red Vented Clutch Bell/Drum + Adjustable Sheave Pulley
• 1500rpm Engagement Springs with Red Reinforced Friction Plates for Rapid Reliable Clutch Engagement
• Red Anodized Vented Clutch Bell with Large Tapered Vents and Splined Center Bore
• Adjustable 6-Groove Sheave: 3 Straight Ramps for Quicker Takeoff + 3 Curved Ramps for Higher Top Speed
• Cross-Drilled Holes and Tapered Vents on Outer Drive Face for Enhanced Heat Dissipation

SKU: 1200-1275 | Brand: RDLN | Spring Tension: 1500rpm | Bell ID: 107mm | Bell OD: 117mm | Bell Splines: 22 (11.2mm ID peak to peak) | Shoe ID: 24mm flat/28mm round | Shoe OD: 105mm | Shoe Height: 30mm | Sheave OD: 118mm | Sheave Ramps: 6 (3 straight + 3 curved) | Includes: Clutch shoe assembly, vented bell/drum, adjustable sheave pulley | Origin: Taiwan | Use: Off-road only

139QMA | 139QMB | 1P39QMB | 1P39QMA-2 | YN139QMB | JJ1P39QMB | 139FMA-2 | BD1P39QMB | BN139QMB | 147QMD | Other QMA/QMB/FM engine code variants (50cc GY6)