
The facts.
| Brand | STM |
|---|---|
| Part Number | FKW-S081 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | Kawasaki ZX-10 R / ZX-10 RR (2004–2026) |
| Anti-Hopping Mechanism | Patented ball-ramp system |
| Spring Type | Diaphragm spring |
| Weight Saving | approx. 0.7–0.8 kg (rotating mass reduction) |
| Intended Use | Track and high-performance road riding |
DescriptionThe whole story▼
When tenths of a second matter at the apex, the STM slipper clutch for the Kawasaki ZX-10 R/RR is the upgrade that separates controlled aggression from dangerous snap. Engineered specifically for the ZX-10 R and ZX-10 RR across every model year from 2004 to 2026, part number FKW-S081 delivers race-proven back-torque limiting with the precision STM's patented ball-ramp technology is renowned for.
Key Features
- Patented ball-ramp mechanism precisely governs the anti-hopping function, delivering consistent, predictable performance at high rpm — lap after lap
- Eliminates engine over-rev on downshifts, maintaining rear-wheel traction and keeping the chassis settled under hard braking into corners
- Minimises rear-wheel hop and reduces highside trigger impulse, significantly lowering the risk of a crash at speed
- Enables controlled rear-wheel slides for confident, sporting cornering without sudden lock-up
- Improved clutch-release feel courtesy of a diaphragm spring that eliminates pressure-plate wobble — cleaner engagement in and out of corners
- Meaningful weight saving of approximately 0.7–0.8 kg by reducing rotating mass, sharpening throttle response and overall ZX-10 R/RR performance
Race-Engineered Back-Torque Control
On track, the margin between a smooth, fast downshift and a tank-slapper is measured in milliseconds. STM's slipper clutch intervenes the moment back-torque exceeds a calibrated threshold, partially disengaging the clutch pack to allow the rear wheel to spin freely rather than skip or lock. The result is a rear end that stays planted through aggressive corner entries — giving you the confidence to brake later and carry more corner speed.
The diaphragm spring design is a step beyond conventional coil-spring slipper clutches. It keeps the pressure plate tracking true under the high centrifugal loads of sustained high-rpm use, translating into a lever feel that is progressive and consistent rather than grabby or vague. Riders moving from a stock Kawasaki clutch will immediately notice both the improved modulation and the reduced lever effort.
Reduced Rotating Mass for Sharper Performance
At the level of engineering STM applies, every component in the assembly is scrutinised for mass. The FKW-S081 achieves a reduction of approximately 0.7–0.8 kg in rotating mass compared to the standard unit. On a motorcycle as responsive as the ZX-10 R/RR, that difference is tangible: faster revs on throttle pick-up, crisper engine braking modulation, and a marginal but real improvement in overall lap times. For class racing where homologation allows aftermarket clutches, this is one of the highest-value modifications available.
Fitment and Compatibility
The STM FKW-S081 slipper clutch is a direct-fit replacement designed exclusively for the Kawasaki ZX-10 R and ZX-10 RR, covering all model years from 2004 through to 2026. Always verify your specific build date and specification against STM's current fitment guide before ordering.
- Kawasaki ZX-10 R — 2004 to 2026
- Kawasaki ZX-10 RR — all years within the 2004–2026 range
Specifications
| Attribute | Detail |
|---|---|
| Brand | STM |
| Part Number | FKW-S081 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | Kawasaki ZX-10 R / ZX-10 RR (2004–2026) |
| Anti-Hopping Mechanism | Patented ball-ramp system |
| Spring Type | Diaphragm spring |
| Weight Saving | approx. 0.7–0.8 kg (rotating mass reduction) |
| Intended Use | Track and high-performance road riding |
FitmentWhich bikes this fits▼
- Kawasaki ZX-10 R/RR (2004–2026)
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