K-Tech FSS-021 fork oil seals kit for Yamaha YZF-R1 M RN32 RN49 RN65
02 · Data & docs

The facts.

Technical data
Part NumberFSS-021
BrandK-Tech
Seal ManufacturerNOK
Inner Diameter43.00 mm
Outer Diameter55.10 mm
Height (1)11.00 mm
Height (2)14.00 mm
Quantity2 oil seals
FitmentYamaha 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)
07 · Support

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08 · Paddock

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