
The facts.
| Part Number | FSS-021 |
|---|---|
| Brand | K-Tech |
| Seal Manufacturer | NOK |
| Inner Diameter | 43.00 mm |
| Outer Diameter | 55.10 mm |
| Height (1) | 11.00 mm |
| Height (2) | 14.00 mm |
| Quantity | 2 oil seals |
| Fitment | Yamaha YZF-R1 M RN32, RN49, RN65 (2015–2026) |
DescriptionThe whole story▼
When lap times depend on fork integrity, the K-Tech Oil Seals Kit FSS-021 keeps the Yamaha YZF-R1 M's front suspension performing at its absolute limit. Manufactured by NOK — the original-equipment seal supplier chosen by Japan's leading suspension manufacturers — these precision oil seals are engineered to hold under the punishing loads of both track days and hard road riding, cycle after cycle.
Key Features
- NOK-manufactured seals: the same supplier trusted as OEM by Japan's foremost suspension brands, delivering proven reliability and exceptional service life.
- Exact-fit dimensions of 43.00 x 55.10 x 11.00/14.00 mm ensure a direct, no-modification replacement on RN32, RN49 and RN65 chassis.
- Complete kit with two oil seals covers a full fork service in one purchase, eliminating the risk of mismatched components.
- Maintains consistent damping performance under extreme conditions — track heat, repeated braking zones and aggressive corner loading.
- Precision sealing lip geometry prevents oil weeping and contamination ingress, protecting the fork internals between service intervals.
Performance on Track and Road
The Yamaha YZF-R1 M was built around an Öhlins Electronic Racing Suspension system, and any compromise in fork seal integrity directly undermines that investment. A weeping seal bleeds off oil film, corrupts damping consistency and deposits oil onto the brake disc — an unacceptable scenario on circuit. The FSS-021 kit restores the fork to its designed operating state with components that meet the same specification standard as factory-fitted seals, not a lesser aftermarket approximation.
NOK's manufacturing tolerances are held to the exacting standards demanded by OEM suspension contracts. That same precision translates directly to aftermarket fitment: the seals seat correctly at first installation and resist the thermal cycling that degrades cheaper alternatives over repeated track sessions.
Installation Note
This kit is suitable for M models of the Yamaha YZF-R1 only — it is not interchangeable with the standard R1. Installation must be carried out by an authorised K-Tech Service Centre. Specialist tools and technical knowledge are required to achieve the full performance and safety benefit of this product.
Fitment & Compatibility
This kit fits the following Yamaha models exclusively:
- Yamaha YZF-R1 M — RN32 (2015–2016)
- Yamaha YZF-R1 M — RN49 (2017–2020)
- Yamaha YZF-R1 M — RN65 (2021–2026)
Specifications
| Part Number | FSS-021 |
|---|---|
| Brand | K-Tech |
| Seal Manufacturer | NOK |
| Inner Diameter | 43.00 mm |
| Outer Diameter | 55.10 mm |
| Height (1) | 11.00 mm |
| Height (2) | 14.00 mm |
| Quantity | 2 oil seals |
What's includedEverything in the box▼
- 2x K-Tech oil seals for Yamaha YZF-R1 M RN32, RN49 and RN65 (2015–2026)
FitmentWhich bikes this fits▼
- Yamaha YZF-R1 M RN32, RN49, RN65 (2015–2026)
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