KOSO CLUTCH PULLEY AEROX

KOSO Aluminum Alloy Torque Cam Set

1. What It Is / Role

   • A torque cam set (also called a “driver” or “cam”) is a CVT component that helps control how torque is transferred from the engine to the clutch.

   • In KOSO’s design, this set is optimized for performance: it changes how the clutch engages and responds under load / throttle.

   • According to KOSO’s product catalog, they make torque cams for AEROX V2. 

2. Material / Build Quality

   • Made from high-quality aluminum alloy, which is lighter than many stock torque driver / cam sets. This helps reduce the rotational mass of the CVT system.The lighter construction improves acceleration response because there's less inertia for the drive system to overcome.  

   • Performance Characteristics

   • Optimized Groove Angles: KOSO provides different groove (“groove angle”) settings — for example, a 50° groove (sporty shifting) or 48° groove (smoother, more like stock) for some models. 

   • Gear Ratio: With KOSO’s torque cam, the effective CVT ratio can change. For their aero/N‑MAX / Aerox‑type kit, KOSO lists a gear ratio of 3.7 vs “standard” 3.2.

   • Weight Reduction: KOSO’s cam set is about 1045 g, whereas the stock (standard) torque driver is 1340 g. That’s a reduction of ~295 g, which significantly lowers rotating mass. 

3. Durability

   • Despite being lightweight, aluminum alloy is still very strong and designed for high RPM / high-stress use.

   • The material and design help in reducing wear and tear since the piece is precisely machined.

   • Less mass means less stress on other CVT parts due to rotational forces being more controlled / optimized.

4. Benefits / Advantages

   • Improved Acceleration: Thanks to reduced inertia, the clutch system can spool up faster, giving a more responsive throttle.

   • Better Torque Transfer: With optimized cam grooves and design, more of the engine’s torque is effectively used.

   • Smoother Engagement: Depending on which groove angle is chosen, the clutch engagement can be tuned to be smoother or more aggressive.

   • Increased Efficiency: Lower rotating mass + better engagement can reduce energy loss in CVT, improving power delivery efficiency.

   • Longer CVT Life: Because of optimized torque delivery and lower stress (when tuned correctly), other CVT components (belt, clutch shoes) may experience less harsh wear.

5. Possible Drawbacks / Trade‑offs

   • If you go for a very “sporty” groove angle (e.g. 50°), the clutch engagement may be more aggressive and could lead to jerkier starts if not matched with the right belt / spring.

   • Less inertia (due to lighter weight) means less “flywheel effect” — at very low RPMs, the response might feel different or less smooth.

   • Installing a new torque cam set usually requires a CVT teardown; it’s not a plug‑and‑play like a bolt-on body part.

   • For full benefit, you might need to upgrade or re‑tune roller weights, contra (torque) spring, belt, etc.

   • Performance parts like this may increase wear on CVT belt/shoes if not matched correctly or regularly maintained.