The facts.
| Brand | K-Tech |
|---|---|
| Part Number | FSS-019 |
| Inner Diameter | 43.00 mm |
| Outer Diameter | 55.10 mm |
| Height (1) | 9.50 mm |
| Height (2) | 10.50 mm |
| Quantity | 2x oil seals |
| Technology | NOK / KYB compatible |
| Fitment | Yamaha YZF-R6 RJ27 (2017–2026) |
DescriptionThe whole story▼
When lap times matter, fork seal integrity is non-negotiable. The K-Tech FSS-019 oil seal kit is engineered specifically for the Yamaha YZF-R6 RJ27 (2017–2026), drawing on NOK and KYB technology to deliver race-grade sealing performance that keeps your forks consistent lap after lap, session after session.
Key Features
- Manufactured using NOK technology — the same supplier trusted by factory race teams for fork oil seal reliability under sustained high-load conditions.
- KYB-compatible design ensures a direct OEM-spec fitment, eliminating guesswork and reducing installation time at the track.
- Precision dimensions (43.00 mm inner diameter, 55.10 mm outer diameter) deliver an exact seal against the fork stanchion, preventing oil weeping that degrades damping consistency.
- Dual-height profile (9.50 mm and 10.50 mm) replicates the original dual-lip seal geometry, blocking both oil loss and ingress of fine grit — critical on circuit where brake dust and debris are constant.
- Drop-in replacement for the factory seals — no machining, no adaptation, no compromise to fork geometry or spring preload settings.
Track Performance & Build Quality
On circuit, fork seal condition directly influences how faithfully your suspension responds to compression and rebound adjustments. A weeping seal bleeds damping oil onto the dust wiper and eventually the brake disc, introducing unpredictability into braking zones. The K-Tech FSS-019 kit addresses this at the source: the NOK-specification rubber compound resists heat cycling and the chemical aggression of fork oil, maintaining a positive seal across a wide operating temperature range.
The kit is produced to tolerances that match the original Yamaha specification for the RJ27 chassis, so there is no risk of the seal sitting proud or recessed in the fork leg. Correct seating means consistent oil film on the stanchion, which in turn means the damper behaves exactly as your suspension technician set it — whether you are running a stock cartridge or a K-Tech upgrade.
Road Use & Longevity
For riders who use their YZF-R6 on the road as well as the track, the FSS-019 offers the same benefits: clean fork legs, predictable steering, and the confidence of knowing the seals will outlast budget alternatives. Fitting quality replacement seals at each service interval is the single most cost-effective way to protect a fork cartridge investment.
Installation Note
This kit is designed exclusively for the Yamaha YZF-R6 RJ27 (2017–2026). K-Tech recommends installation by an authorised K-Tech service centre to ensure correct seating depth and to preserve the performance and safety characteristics of the product.
Fitment & Compatibility
- Yamaha YZF-R6 RJ27 — model years 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Specifications
| Attribute | Detail |
|---|---|
| Part Number | FSS-019 |
| Inner Diameter | 43.00 mm |
| Outer Diameter | 55.10 mm |
| Height (1) | 9.50 mm |
| Height (2) | 10.50 mm |
| Quantity | 2x oil seals |
| Technology | NOK / KYB compatible |
| Fitment | Yamaha YZF-R6 RJ27 (2017–2026) |
What's includedEverything in the box▼
- 2x oil seals
FitmentWhich bikes this fits▼
- Yamaha YZF-R6 RJ27 (2017–2026)
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