The facts.
| Brand | K-Tech |
|---|---|
| Part Number | FSS-005 |
| Seal Manufacturer | NOK |
| Inner Diameter | 41.00 mm |
| Outer Diameter | 53.00 mm |
| Height (1) | 8.00 mm |
| Height (2) | 10.50 mm |
| Quantity | 2 oil seals (one pair) |
| Fitment | Yamaha YZF-R3 (2015–2018) |
DescriptionThe whole story▼
Engineered to OEM tolerances and manufactured by NOK — the original equipment supplier to many of Japan's leading suspension manufacturers — this K-Tech fork oil seal kit is the benchmark replacement for the Yamaha YZF-R3. Where inferior aftermarket seals compromise fork action and invite oil weepage, these precision-ground NOK seals restore your suspension's integrity with material quality that matches or surpasses the factory originals.
Key Features
- NOK-manufactured seals: the same supplier trusted by Japan's top-tier OEM suspension producers, delivering consistent dimensional accuracy and long service life.
- Direct OEM replacement: dimensions of 41.00 x 53.00 x 8.00/10.50 mm mirror the factory specification exactly — no modification required.
- Supplied as a pair: a complete set covering both fork legs for a thorough, balanced service in a single purchase.
- Leak-free performance: premium lip geometry maintains a positive seal under temperature cycling and sustained road or track use, preventing oil migration onto the brake components.
- Part number FSS-005: straightforward cross-reference for confident ordering.
Build Quality and Materials
NOK's reputation rests on decades of supplying original-equipment seals to Honda, Yamaha, Kawasaki, and Showa. The compound used in these fork oil seals is formulated for compatibility with the full range of fork oils, resisting swelling and hardening across the temperature extremes a YZF-R3 encounters from a cold commute to a sustained track session. The dual-height lip profile — 8.00 mm and 10.50 mm — is not a generic off-the-shelf dimension; it reflects the precise geometry of the Kayaba forks fitted to the 2015–2018 YZF-R3, ensuring the wiper lip contacts the stanchion correctly without excess drag or premature wear.
Performance and Suspension Integrity
A leaking fork seal does far more damage than the oil stain on your tyre suggests. Fork oil loss changes damping characteristics progressively and unpredictably, while oil contaminating the front brake rotor creates a genuine safety hazard. Replacing seals with a correctly dimensioned, premium-compound NOK unit through K-Tech's FSS-005 kit restores consistent damping response and protects the braking system — both critical considerations whether the R3 is used daily on road or pushed hard at a circuit.
Fitment and Compatibility
This kit is designed specifically for the following application:
- Yamaha YZF-R3 — model years 2015, 2016, 2017, 2018
If your model year falls outside this range, please verify the fork inner diameter before ordering, as later R3 generations may use a different specification.
Installation Note
Fork seal replacement requires fork removal, disassembly, and the use of a correct-diameter seal driver to seat the seals without damage. K-Tech recommends installation by an authorised K-Tech Service Centre. Incorrect fitment can compromise both suspension performance and rider safety.
Specifications
- Part number: FSS-005
- Inner diameter: 41.00 mm
- Outer diameter: 53.00 mm
- Height (1): 8.00 mm
- Height (2): 10.50 mm
- Quantity supplied: 2 oil seals (one pair)
- Seal manufacturer: NOK
- Fitment: Yamaha YZF-R3 (2015–2018)
What's includedEverything in the box▼
- 2x K-Tech Fork Oil Seals (NOK) for Yamaha YZF-R3 (2015–2018)
FitmentWhich bikes this fits▼
- Yamaha YZF-R3 (2015–2018)
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