K-Tech Fork Oil Seal & Dust Cap Kit – Yamaha YZF-R1 (2003–2026) FSK-019
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Engineered specifically for the Yamaha YZF-R1 across every generation from 2003 to 2026, the K-Tech FSK-019 fork oil seal and dust cap kit delivers the kind of all-day confidence that only a precision-fit, premium-quality seal set can provide. Sourced from NOK — one of the most respected seal manufacturers in the industry — every component in this kit is built to maintain your suspension's performance mile after mile, season after season.
Key Features
- Precision NOK-manufactured oil seals engineered for a consistent, leak-free fit across the full 2003–2026 YZF-R1 range
- Two oil seals (43.00 mm inner diameter / 55.00 mm outer diameter) prevent fork oil loss and protect internal components
- Two dust caps shield the fork legs from dirt, grit, and moisture, extending seal service life significantly
- Exact OEM-matching dimensions ensure a straightforward installation with no modification required
- Direct replacement for worn or weeping fork seals — restores suspension feel and handling precision
Build Quality & Performance
NOK's reputation in the sealing industry is built on tight manufacturing tolerances and materials that maintain elasticity under repeated compression and temperature cycling. The oil seals in the FSK-019 kit retain fork oil under all riding conditions — from a spirited road run to sustained track use — while the paired dust caps form the first line of defence against the contamination that accelerates fork wear. Using a matched kit from a single manufacturer means both sealing layers work in harmony, which is exactly the kind of detail that separates a properly maintained suspension from one that merely functions.
Fitment & Compatibility
This kit fits the Yamaha YZF-R1 for model years 2003 through to 2026. The 43.00 mm inner diameter and 55.00 mm outer diameter match the fork tube specification used across this entire production run. If you are unsure whether your specific build year or fork specification is covered, confirm with an authorised K-Tech service centre before ordering.
Installation Note
Installation should be carried out exclusively by an authorised K-Tech service centre. Specialist tools and technical knowledge are required for correct fitting. Attempting installation without the appropriate equipment risks damage to the fork tubes or incorrect seating of the seals.
Specifications
- Part number: FSK-019
- Brand: K-Tech
- Seal manufacturer: NOK
- Inner diameter: 43.00 mm
- Outer diameter: 55.00 mm
- Contents: 2x oil seals, 2x dust caps
- Fitment: Yamaha YZF-R1 (2003–2026)
| Brand | K-Tech |
|---|---|
| Part number | FSK-019 |
| Seal manufacturer | NOK |
| Inner diameter | 43.00 mm |
| Outer diameter | 55.00 mm |
| Contents | 2x oil seals, 2x dust caps |
| Fitment | Yamaha YZF-R1 (2003–2026) |
| Installation | Authorised K-Tech service centre recommended |
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2x fork oil seals (NOK)
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2x dust caps
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// K-Tech
K-Tech Fork Oil Seal & Dust Cap Kit – Yamaha YZF-R1 (2003–2026) FSK-019

Tech specs
- Brand
- K-Tech
- Part number
- FSK-019
- Seal manufacturer
- NOK
- Inner diameter
- 43.00 mm
- Outer diameter
- 55.00 mm
- Contents
- 2x oil seals, 2x dust caps
- Fitment
- Yamaha YZF-R1 (2003–2026)
- Installation
- Authorised K-Tech service centre recommended
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
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