KOSO CLUTCH BELL AEROX

KOSO Clutch Bell for Aerox 155

• Compatibility: Designed for Yamaha Aerox 155 (and sometimes contemporarily listed with NMAX 155) in KOSO’s clutch‑system / CVT product lines.

• Material & Build: According to KOSO’s own catalog, the “Lightweight Clutch Bell V2” is made to reduce weight (KOSO claims a weight reduction of ~142 g compared to stock) — lighter bell means less rotating mass, which improves engine response. 

• Design:

  • Precision CNC‑machined for good balance and strength. Likely made of a durable steel or alloy (common for performance clutch bells) — chosen to handle high RPM and high stress.

• Performance Benefits:

  • Weight Reduction: Less mass means clutch system can accelerate / decelerate faster → better throttle response.

  • Better Heat Dissipation: With less material in rotating parts, it can manage heat more effectively during high-stress CVT operation.

  • Improved Engagement: Performance bells often offer more consistent clutch engagement under load and RPM, especially when paired with aftermarket clutch shoes and springs.

• Use-Case: Best suited for performance / tuned setup — if you have upgraded clutch shoes, springs, or variator, this bell helps maximize the benefit.

• Installation: Should be a direct fit for Aerox 155 CVT system if you're installing the correct KOSO bell version made for it.

• Durability: Built for performance, but as with any aftermarket performance bell, life depends on usage (RPM, load, maintenance).

• Potential Trade-offs:

  • Reduced mass is good for response, but might reduce the “flywheel effect” — at very low RPMs or with very light springs, clutch engagement behavior could change.

  • More aggressive clutch setups (with lightweight bell + aggressive spring / clutch shoes) might stress other CVT components (belt, rollers).