{"product_id":"stm-slipper-clutch-yamaha-yzf-r1-fya-s140","title":"STM Slipper Clutch Yamaha YZF-R1 (2009-2014) FYA-S140","description":"\u003cp\u003eOn the track, the margin between a fast lap and a highside is measured in milliseconds. The STM slipper clutch for the Yamaha YZF-R1 (2009-2014) closes that margin decisively — eliminating rear-wheel hop under hard braking and aggressive downshifts so you can trail-brake later, slide the rear with confidence, and carry more corner speed every single lap.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents engine over-rev on downshifts, delivering a stable, controlled deceleration phase without rear-wheel chatter\u003c\/li\u003e\n\u003cli\u003eSignificantly reduces rear-wheel hop, improving traction and stability under the heaviest braking\u003c\/li\u003e\n\u003cli\u003eLowers the trigger impulse of a highside, increasing safety at race and road speeds alike\u003c\/li\u003e\n\u003cli\u003eEnables controlled rear-wheel slides for sharper, more progressive cornering and improved feel\u003c\/li\u003e\n\u003cli\u003eRefined clutch closing phase in corners actively prevents the front-end tuck associated with abrupt engine braking\u003c\/li\u003e\n\u003cli\u003eDiaphragm spring design eliminates pressure-plate flutter, giving the lever a smooth, consistent release feel\u003c\/li\u003e\n\u003cli\u003ePatented ball-ramp mechanism governs the anti-hopping function with precision across the entire rev range\u003c\/li\u003e\n\u003cli\u003eWeight saving of approximately 0.7–0.8 kg through reduced rotating mass, directly improving throttle response and acceleration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngineering Behind the Design\u003c\/h2\u003e\u003cp\u003eSTM's ball-ramp anti-hopping system is a genuine racing solution adapted for the street-legal YZF-R1. When the engine overruns the rear wheel — the scenario that causes rear-wheel hop and, at its worst, a highside — the ramp mechanism partially disengages the clutch pack, allowing the rear tyre to maintain contact with the road and the rider to stay in control. The moment drive is reapplied, the clutch re-engages seamlessly, with no lag and no drama.\u003c\/p\u003e\u003cp\u003eThe diaphragm spring replaces the conventional coil-spring arrangement, smoothing out pressure-plate movement and giving the clutch lever a progressive, linear feel that long-distance and track riders alike will appreciate after an hour of hard riding.\u003c\/p\u003e\u003ch2\u003ePerformance Gains on Track and Road\u003c\/h2\u003e\u003cp\u003eThe reduction in rotating mass — roughly 0.7 to 0.8 kg — is one of the less-discussed advantages of the STM unit. On a machine as responsive as the YZF-R1, that saving translates into crisper throttle response and marginally faster acceleration out of slow corners. Combined with the anti-hopping behaviour, the result is a clutch that actively makes you faster rather than simply transmitting power.\u003c\/p\u003e\u003ch2\u003eFitment \u0026amp; Compatibility\u003c\/h2\u003e\u003cp\u003eThis clutch is a direct, application-specific fit for the following models:\u003c\/p\u003e\u003cul\u003e\u003cli\u003eYamaha YZF-R1 — 2009, 2010, 2011, 2012, 2013, 2014\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003ePart number FYA-S140 is unique to this fitment. Always verify your model year and variant before ordering.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrand: STM\u003c\/li\u003e\n\u003cli\u003ePart number: FYA-S140\u003c\/li\u003e\n\u003cli\u003eType: Slipper clutch (anti-hopping clutch)\u003c\/li\u003e\n\u003cli\u003eFitment: Yamaha YZF-R1 (2009–2014)\u003c\/li\u003e\n\u003cli\u003eAnti-hopping mechanism: Patented ball-ramp system\u003c\/li\u003e\n\u003cli\u003eSpring type: Diaphragm spring\u003c\/li\u003e\n\u003cli\u003eWeight saving: approximately 0.7–0.8 kg vs. stock (rotating mass reduction)\u003c\/li\u003e\n\u003cli\u003eIntended use: Track and high-performance road riding\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STM","offers":[{"title":"Default Title","offer_id":53168706715914,"sku":"FYA-S140","price":1028.05,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/FDU-S050_26c8cce3-089d-4888-8a90-12de40d6562a.png?v=1780811781","url":"https:\/\/inter-pace.com\/products\/stm-slipper-clutch-yamaha-yzf-r1-fya-s140","provider":"Inter-Pace","version":"1.0","type":"link"}