STM Slipper Clutch for Yamaha YZF-R7 (2021–2026) – FYA-S190
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STM has built its reputation on motorsport-derived clutch engineering, and the FYA-S190 slipper clutch for the Yamaha YZF-R7 is the definitive expression of that heritage. Designed from the ground up for aggressive street and track use, its patented ball-ramp anti-hopping mechanism and diaphragm spring pressure plate bring genuine race-class clutch feel and protection to one of the most exciting middleweight sportsbikes on sale today.
Key Features
- Patented ball-ramp technology controls the anti-hopping function precisely at high engine speeds, giving you confidence under hard trail-braking and aggressive downshifts.
- Prevents rear-wheel hop and reduces engine over-rev on downshifts, dramatically lowering the risk of a highside and keeping the chassis settled mid-corner.
- Controlled rear-wheel slide capability — rear-end movement stays managed and predictable rather than sudden, improving corner-entry handling.
- Diaphragm spring pressure plate eliminates pressure-plate judder on clutch release, delivering a smooth, progressive feel at the lever that is noticeably more refined than the OEM unit.
- Significant rotating-mass reduction of approximately 0.7–0.8 kg, freeing up engine response and improving overall performance of the YZF-R7.
- Better management of clutch closure in corners prevents the bike from tucking the front under deceleration, adding an important layer of active safety.
Design, Finish and Heritage
STM has been supplying slipper clutches to World Superbike and Moto2 teams for decades. The FYA-S190 carries that racing DNA into a bolt-on kit engineered specifically for the YZF-R7 platform. Every component reflects the company's Italian precision manufacturing — close-tolerance machined basket and hub geometry, carefully selected friction and steel plate compounds, and an anodised finish that holds up to repeated high-temperature cycling without degrading. This is not a universal kit adapted to fit; it is a model-specific design matched to the YZF-R7's engine character, gearbox ratios and chassis balance.
Performance on Road and Track
On track the benefits are immediate. Braking deep into corners with the throttle closed, the ball-ramp mechanism progressively disengages drive, preventing the rear tyre from locking and launching the rider over the bars. On the road the same technology translates into a more forgiving, fatigue-free clutch action — useful during technical mountain-road riding where rapid downshifts are frequent. The weight saving from reduced rotating mass sharpens throttle response and improves the revving character of the CP2 parallel-twin engine without any engine modifications.
Fitment and Compatibility
The STM FYA-S190 is a direct, model-specific fitment for the following motorcycle:
- Yamaha YZF-R7 — model years 2021, 2022, 2023, 2024, 2025, 2026
No chassis modifications are required. Always consult the supplied installation instructions and, where available, seek fitment by a qualified motorcycle technician.
Specifications
- Brand: STM
- Part number: FYA-S190
- Type: Slipper / anti-hopping clutch
- Fitment: Yamaha YZF-R7 (2021–2026)
- Anti-hopping mechanism: Patented ball-ramp system
- Pressure plate: Diaphragm spring
- Rotating mass reduction: approx. 0.7–0.8 kg
- Intended use: Road and track
| Brand | STM |
|---|---|
| Part number | FYA-S190 |
| Type | Slipper / anti-hopping clutch |
| Fitment | Yamaha YZF-R7 (2021–2026) |
| Anti-hopping mechanism | Patented ball-ramp system |
| Pressure plate | Diaphragm spring |
| Rotating mass reduction | approx. 0.7–0.8 kg |
| Intended use | Road and track |
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