STM slipper clutch FYA-S160 for Yamaha YZF-R3 2014-2018
Approx. 0.7-0.8 k g
02 · Data & docs

The facts.

Technical data
BrandSTM
Part numberFYA-S160
TypeSlipper clutch (anti-hopping clutch)
FitmentYamaha YZF-R3 (2014-2018)
Slipper mechanismPatented ball-ramp system
Spring typeDiaphragm spring
Weight savingApprox. 0.7-0.8 kg vs OEM (reduced rotating mass)
DescriptionThe whole story▼

Designed for riders who demand smooth, confident control on both road and track, the STM slipper clutch for the Yamaha YZF-R3 (2014-2018) transforms the way the bike behaves under hard braking and aggressive downshifts. Part number FYA-S160, it slots in as a direct replacement and immediately rewards you with a more composed, predictable ride every time you tip into a corner.

Key Features

  • Prevents engine over-rev on downshifts, keeping the rear wheel planted and the bike settled through braking zones
  • Reduces rear-wheel hop significantly, translating to better traction and improved stability mid-corner
  • Lowers the trigger impulse for a highside, adding a meaningful safety margin at speed
  • Allows controlled rear-wheel slides, giving sport and track riders greater confidence when carrying corner speed
  • Patented ball-ramp mechanism governs the slipper function with precision at high engine speeds, ensuring consistent, repeatable performance
  • Diaphragm spring design eliminates pressure-plate chatter, delivering a smoother, more progressive lever release feel that reduces hand fatigue on long rides
  • Weight saving of approximately 0.7-0.8 kg through reduced rotating mass, directly improving throttle response and overall YZF-R3 performance

Engineering Behind the STM Slipper Clutch

STM's proprietary ball-ramp technology is the heart of this assembly. Under normal drive conditions the ramps lock up and transmit full torque, just as a standard clutch would. The moment back-torque exceeds the pre-set threshold during downshifts, the ramps separate the pressure plate fractionally, allowing the engine to decelerate independently of the rear wheel. The result is a rear end that stays calm and steerable rather than snapping sideways.

The diaphragm spring replaces the conventional coil-spring stack found in the OEM unit. Beyond the weight saving this change brings a noticeably lighter lever pull that is consistent across the full travel — a real benefit during back-to-back track sessions or spirited road riding where repeated clutch inputs would otherwise leave the left hand fatigued.

Clutch Engagement and Corner Confidence

One area where the STM unit stands out is its control of the clutch closing phase in corners. By managing how quickly drive is reintroduced, it reduces the tendency for the front end to tuck — a phenomenon known on the circuit as tipping-in understeer triggered by abrupt engagement. This makes the YZF-R3 feel more composed and predictable when you roll the throttle back on mid-bend, whether you are threading through a technical road section or pushing on a track day.

Fitment and Compatibility

This slipper clutch is engineered as a direct-fit replacement for the following model:

  • Yamaha YZF-R3 — model years 2014, 2015, 2016, 2017 and 2018

No modifications to the engine cases or clutch cover are required. Always verify your specific model year and variant before fitting.

Specifications

Attribute Detail
Brand STM
Part number FYA-S160
Type Slipper clutch (anti-hopping clutch)
Fitment Yamaha YZF-R3 (2014-2018)
Slipper mechanism Patented ball-ramp system
Spring type Diaphragm spring
Weight saving Approx. 0.7-0.8 kg vs OEM (reduced rotating mass)
FitmentWhich bikes this fits▼
  • Yamaha YZF-R3 (2014–2018)
07 · Support

Questions, one topic at a time.

Estimate your shipping

Get the real shipping cost for this item to your address — the same rates as checkout.

Pick your countrySame rates as checkout

Choose a destination and hit Estimate — we fetch the live rates for this item.

How long does delivery take?

We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.

How much does shipping cost?

Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.

Do you ship to my country?

Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.

Will I have to pay customs or import duties?

Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.

How can I track my order?

As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.

What if an item is out of stock?

On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.

Didn’t find your answer?

Our team will personally help you choose the right gear or part — around 24h for a reply.