KOSO CVT Sport Clutch Set V3

KOSO SPORT CLUTCH KIT

Upgrade your scooter's CVT with the KOSO Sport Clutch Kit – a matched set of sport clutch and lightweight clutch bell designed for quicker, smoother take-offs and more efficient power transfer from the engine to the rear wheel.

Item No.: FN073100
Brand: KOSO
Models: Yamaha CYGNUS GRYPHUS 125 / NMAX 155 / AEROX 155
System: CVT automatic clutch
Color: Black
Clutch spring: 1,500 RPM
Clutch engagement speed: Approx. 3,400 RPM

Key Features

• Lightweight clutch bell: 106 g lighter than the original part for quicker throttle response
• Precision-balanced design: Carbon-steel clutch bell with a heavy-load and light-load design for better rotational accuracy and dynamic balance
• Reinforced clutch: Reinforced inner steel plate reduces clutch deformation
• Heat-resistant friction material: Helps improve power transmission and reduce slipping
• 1,500 RPM clutch spring: Optimizes clutch engagement for sporty take-offs
• Noise-reducing clutch bell: Uses a structure with a noise-reducing ring

Specifications

• Sport clutch size: D122.7 × H38.2 mm
• Sport clutch weight: 231 g
• Clutch spring free length: 31.5 mm
• Clutch bell material: Carbon steel (central axis)
• Clutch bell weight: 709 g

Package Includes

• Sport clutch × 1
• Clutch outer (clutch bell) × 1

Tested Performance (KOSO dyno test, Cygnus Gryphus)

• Peak power: 11.1 HP with KOSO clutch kit vs. 10.9 HP with standard clutch
• Stronger power at low–mid speed: 3.4 HP vs. 2.8 HP at 20 km/h, 6.5 HP vs. 6.1 HP at 40 km/h
• Reaches top speed faster: 33.7 s vs. 34.3 s

Test uses the same KOSO drive pulley set with only the clutch and clutch bell changed. Results may vary depending on testing environment and weather; for reference only.

Installation Notes

• Clutch nut torque: 45 N·m (450 kgf·cm)
• Drive face nut torque: 76 N·m (760 kgf·cm)
• Professional installation by a qualified mechanic is recommended. Please follow the KOSO instruction sheet included with the product.