What fork seal fits a Yamaha YZF-R1?

The Yamaha YZF-R1 uses a front fork that changed across model years: 41 mm (1998–1999), 41 mm (2000–2001), 43 mm (2002–2003), 43 mm (2004–2006), 43 mm (2007–2008), 43 mm (2009–2014), 43 mm (2015–2019), 43 mm (2020–2026). We stock the manufacturer-verified seal and bushing kits for it; matching is done off the verified application list, not just the seal size.

What size is the Yamaha YZF-R1 fork?

The Yamaha YZF-R1 has a front fork that changed across model years: 41 mm (1998–1999), 41 mm (2000–2001), 43 mm (2002–2003), 43 mm (2004–2006), 43 mm (2007–2008), 43 mm (2009–2014), 43 mm (2015–2019), 43 mm (2020–2026).

Can I use any seal with the same dimensions?

No. Fork seals can share a size and still not seat correctly in a different fork design, so use the seal verified for your bike. The kits listed here are confirmed by the manufacturer to fit the Yamaha YZF-R1.

What fork oil does the Yamaha YZF-R1 use?

The Yamaha YZF-R1 uses 5wt fork oil, about 368 ml per leg (factory fill KYB 01M (~5wt)).

Yamaha YZF-R1 Fork Seals

Fork specs for the Yamaha YZF-R1 vary by year (see the table below).Every kit here is verified by the manufacturer to fit this exact bike. Fork seals can share a size and still not seat in a different fork, so we only list what is confirmed for your bike.

Fork typeUpside-down
ForkKayaba 41mm USD (Aprilia Dorsoduro 900 / Shiver 900 / BMW G310 / Triumph Street Triple group)

Years	Fork tube	Fork
1998–1999	41 mm	Kayaba
2000–2001	41 mm	Kayaba
2002–2003	43 mm	Kayaba
2004–2006	43 mm	Kayaba
2007–2008	43 mm	Kayaba
2009–2014	43 mm	Kayaba
2015–2019	43 mm	Kayaba
2020–2026	43 mm	Kayaba

Kit	Years	Seal size	Replaces OEM
55-117	1998–2001	41x53x8	Aprilia 2B004402
55-122	2009–2014	43x55x10.5	Yamaha 5VX-23145-00-00
55-123	2002–2025	43x55x9.5	Kawasaki 92049-0074, Yamaha 1C3-23145-L0-00
57-102	2002–2025	n/a	n/a
57-107	1998–2001	n/a	n/a
55-157	2019	n/a	n/a
56-191	2019	n/a	n/a
56-129	1998–2001	n/a	n/a