STM Slipper Clutch Yamaha YZF-R3 (2019-2026) FYA-S180

A slipper clutch is one of the most rewarding upgrades you can make to a YZF-R3 — and the STM FYA-S180 delivers that benefit without demanding a race budget or a race schedule. Engineered specifically for the Yamaha YZF-R3 across model years 2019 to 2026, it smooths out every downshift on your favourite back road just as effectively as it does on a circuit, giving you more confidence the moment you tip into a corner.

Key Features

• Prevents engine over-rev on downshifts, keeping the rear wheel planted and the chassis composed during braking
• Reduces rear-wheel hop to deliver improved traction and stability under hard deceleration
• Significantly lowers the trigger impulse of a highside, making spirited riding meaningfully safer
• Allows controlled rear-wheel slides — a natural advantage for both track days and flowing road sessions
• Improves clutch closure control mid-corner, preventing the bike from tucking the front under load
• Diaphragm spring design smooths the feel at the lever and eliminates pressure-plate wobble for a cleaner release
• Patented ball-ramp mechanism governs the anti-hopping function with precision at high rpm
• Approximately 0.7–0.8 kg reduction in rotating mass, noticeably sharpening throttle response and overall performance

Everyday Usability

Where many slipper clutches are designed purely for the pits, the STM FYA-S180 is equally at home on a Sunday morning ride. The progressive engagement means town traffic and slow-speed manoeuvring feel natural rather than snatchy, while the weight saving keeps the YZF-R3 feeling nimble and responsive from the moment you pull away. Installation uses the existing basket architecture of the R3, so the learning curve is manageable for a competent home mechanic.

Technology & Build Quality

STM's patented ball-ramp system is the heart of the unit. Under normal throttle-on conditions the ramps lock the clutch pack in full engagement, transmitting drive cleanly. As soon as engine braking forces reverse through the drivetrain — during a rapid downshift or a missed gear — the ramps disengage proportionally, limiting the torque spike that would otherwise spin the rear tyre or snap the chassis sideways. The diaphragm spring replaces the conventional coil-spring stack, producing a more linear lever pull and removing the risk of pressure-plate flutter at sustained high rpm. Every component is manufactured to STM's exacting tolerances, reflecting decades of Italian motorsport engineering applied to a machine that punches well above its displacement.

Fitment & Compatibility

This clutch is a direct-fit replacement designed exclusively for the Yamaha YZF-R3 covering model years 2019 through 2026. No modifications to the engine cases or clutch basket are required. Always verify your specific model year against the part number FYA-S180 before ordering.

Specifications

• Brand: STM
• Part number: FYA-S180
• Type: Slipper clutch (anti-hopping clutch)
• Fitment: Yamaha YZF-R3 (2019–2026)
• Operating mechanism: Patented ball-ramp system
• Spring type: Diaphragm spring
• Weight saving: approximately 0.7–0.8 kg reduction in rotating mass
• Country of manufacture: Italy