K-Tech FSK-019 fork oil seal and dust cap kit for Yamaha YZF-R6 RJ27
02 · Data & docs

The facts.

Technical data
BrandK-Tech
Part NumberFSK-019
Seal ManufacturerNOK
Inner Diameter43.00 mm
Outer Diameter55.00 mm
Kit Contents2x oil seals, 2x dust caps
FitmentYamaha YZF-R6 RJ27 (2017–2026)
DescriptionThe whole story▼

Manufactured by NOK — one of the world's foremost producers of suspension sealing components — the K-Tech FSK-019 fork oil seal and dust cap kit delivers the highest standard of protection for your Yamaha YZF-R6 RJ27. Correct sealing is a genuine safety-critical function: a weeping fork leg affects damping consistency, contaminates brake components and compromises handling precision. This kit removes that risk with OE-grade materials engineered to K-Tech's exacting fitment tolerances for the 2017–2026 RJ27 chassis.

Key Features

  • Safety-critical sealing: prevents fork oil loss that would otherwise degrade damping performance and compromise braking and handling.
  • Manufactured by NOK, a globally recognised leader in suspension seals — same supply chain used by professional race teams.
  • Precision-dimensioned at 43.00 mm inner diameter and 55.00 mm outer diameter for a perfect press-fit on the RJ27 fork legs.
  • Two oil seals effectively block oil migration past the stanchion, preserving fork fluid integrity across extended service intervals.
  • Two dust caps form the first line of defence, excluding road grit, moisture and fine particulates before they can reach the oil seal lip.
  • Direct K-Tech part number FSK-019 ensures you receive the correct, verified kit — no cross-referencing required.

Build Quality & Engineering

NOK's elastomer compounds are formulated to remain flexible across a wide temperature range, resisting the hardening and micro-cracking that causes lesser seals to weep prematurely. The dust caps are dimensioned to sit flush with the fork lowers, eliminating the gap where grime accumulates and accelerates wear on the seal lip. Together, the two-stage sealing system — dust cap plus oil seal — extends service life and maintains the consistent damping feel that the YZF-R6 RJ27's chassis is built around.

Performance & Safety on Road and Track

On a high-revving, track-focused machine like the YZF-R6 RJ27, suspension integrity is not a comfort issue — it is a safety issue. Oil weeping from the fork seals coats the dust wiper, finds its way onto brake components and introduces an unpredictable variable into braking distances. Fitting a certified, correctly dimensioned seal kit at the recommended service interval is the single most cost-effective way to keep the front end behaving as Yamaha and K-Tech intend. The FSK-019 kit makes that service straightforward and reliable.

Fitment & Compatibility

This kit is engineered exclusively for the following model:

  • Yamaha YZF-R6 RJ27 — model years 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026

Always verify your frame designation and fork inner diameter before installation. Installation must be carried out by an authorised K-Tech Service Centre using the appropriate specialist tooling and technical expertise.

Specifications

Attribute Detail
Brand K-Tech
Part Number FSK-019
Seal Manufacturer NOK
Inner Diameter 43.00 mm
Outer Diameter 55.00 mm
Kit Contents 2x oil seals, 2x dust caps
Fitment Yamaha YZF-R6 RJ27 (2017–2026)
What's includedEverything in the box▼
  • 2x fork oil seals (NOK)
  • 2x dust caps
FitmentWhich bikes this fits▼
  • Yamaha YZF-R6 RJ27 (2017–2026)
07 · Support

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