Product Description
RDLN 105mm RACING CLUTCH WITH 1500 RPM SPRINGS
FOR GY6 139QMB / QMA 50cc–80cc 4-STROKE ENGINES
Upgrade your GY6 drivetrain with the RDLN Racing Clutch Assembly, designed for 139QMB/QMA-based 4-stroke engines.
This performance clutch comes pre-assembled with 1500 RPM clutch springs for a higher-RPM, more aggressive clutch engagement than a typical stock setup. Allowing the engine to build additional RPM before clutch engagement can provide a quicker, stronger launch from a stop when properly matched to your engine and CVT setup.
A great upgrade for stock or modified 139QMB engines, including many engines equipped with 72cc and 80cc big-bore kits.
SPECIFICATIONS
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Brand: RDLN
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Product: Performance Racing Clutch Assembly
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Clutch Outer Diameter: 105mm
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Inner Hole Dimensions: 24 x 28mm
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Clutch Springs: 1500 RPM
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Clutch Type: Centrifugal CVT Clutch
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Application: GY6 139QMB / QMA Engine Family
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Engine Type: 4-Stroke
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Quantity: 1 Complete Clutch Assembly
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Made in Taiwan
PERFORMANCE FEATURES
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1500 RPM performance clutch springs
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More aggressive engagement than a typical stock clutch
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Allows engine RPM to build before clutch engagement
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Helps improve initial acceleration and takeoff
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Great for stock and performance-modified engines
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Excellent addition to a tuned CVT system
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Complete assembled clutch — not just replacement springs
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Made in Taiwan
COMPATIBLE ENGINE CODES
Designed for many 139QMB/QMA-family engines, including:
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139QMA
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139QMB
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1P39QMB
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1P39QMA-2
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YN139QMB
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JJ1P39QMB
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139FMA-2
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BD1P39QMB
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BN139QMB
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147QMD
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Other compatible QMA/QMB variants using the same clutch dimensions
COMMON APPLICATIONS
Commonly used on Chinese 4-stroke:
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49cc / 50cc Scooters
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60cc Big-Bore Builds
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72cc Big-Bore Builds
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80cc Big-Bore Builds
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Mopeds
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Small ATVs
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Other vehicles using compatible 139QMB/QMA drivetrains
Common Chinese vehicle brands using 139QMB-style engines may include:
TaoTao / Tao Motor, Ice Bear, Jonway, Roketa, Peace Sports, JMSTAR, SUNL, Tank, Wolf, Bintelli and many others.
Vehicle brand alone does NOT guarantee fitment.
50cc / 72cc / 80cc FITMENT
Many engines advertised as 72cc or 80cc started as 49cc/50cc 139QMB engines and were upgraded with a larger cylinder and piston.
If the engine retains the compatible 139QMB/QMA CVT system and 105mm clutch configuration, this performance clutch may still be used.
Engine displacement alone should NOT be used to determine fitment.
WHAT DO 1500 RPM CLUTCH SPRINGS DO?
The clutch shoes in a centrifugal clutch move outward as engine RPM increases.
The performance springs hold the clutch shoes inward longer than typical stock springs, allowing the engine to build additional RPM before the shoes engage the clutch bell.
This can provide:
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Quicker launch from a stop
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More aggressive clutch engagement
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Improved low-speed acceleration
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Better response on properly tuned performance engines
NOTE: The 1500 RPM designation is a performance spring rating and should not be interpreted as a guarantee that the clutch will engage at exactly 1,500 engine RPM. Actual engagement varies depending on the engine and CVT setup.
GREAT FOR PERFORMANCE BUILDS
This clutch can be combined with other CVT and engine upgrades such as:
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Performance Variators
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Roller Weights
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Sliding Weights
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Performance Drive Belts
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Torque / Contra Springs
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Big-Bore Cylinder Kits
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Performance Camshafts
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Performance Carburetors
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Performance Exhaust Systems
Proper CVT tuning is recommended for the best results.
IMPORTANT — VERIFY FITMENT BEFORE ORDERING
PLEASE COMPARE YOUR ORIGINAL CLUTCH AND ENGINE BEFORE PURCHASING.
Verify the following:
105mm Clutch Outer Diameter
24 x 28mm Inner Hole Dimensions
139QMB / QMA or Compatible Engine Family
Chinese scooters and ATVs can use different components even when the vehicles have the same advertised engine size or similar body style.
DO NOT purchase based on vehicle brand or engine displacement alone.
WILL NOT FIT
This clutch should NOT be assumed to fit larger GY6 125cc or 150cc engines such as:
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152QMI
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157QMJ
These engines normally use a larger clutch system.
ABOUT RDLN
RDLN is a line of aftermarket performance components and upgrade systems for scooters. RDLN products are designed to provide an effective balance of performance, reliability and value for stock and modified applications.
