What fork seal fits a Yamaha YZ80?

The Yamaha YZ80 uses a front fork that changed across model years: 27 mm (1974–1978), 30 mm (1979–1982), 33 mm (1983–1992), 36 mm (1993–2001). 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 YZ80 fork?

The Yamaha YZ80 has a front fork that changed across model years: 27 mm (1974–1978), 30 mm (1979–1982), 33 mm (1983–1992), 36 mm (1993–2001).

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 YZ80.

Yamaha YZ80 Fork Seals

Q: What fork oil does the Yamaha YZ80 use?

The Yamaha YZ80 uses 5wt fork oil (factory fill KYB 01M / Showa SS-05 (~5wt)).

Fork specs for the Yamaha YZ80 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.

Years	Fork tube	Fork
1974–1978	27 mm	Kayaba
1979–1982	30 mm	Kayaba
1983–1992	33 mm	Kayaba
1993–2001	36 mm	Kayaba

Kit	Years	Seal size	Replaces OEM
55-101	1974–1978	27x39x10.5	n/a
55-106	1983–1992	33x45x10.5	n/a
55-110	1993–2001	36x48x8	n/a
57-110	1993–2001	n/a	n/a
57-124	1979–1982	n/a	n/a
57-125	1983–1992	n/a	n/a
56-106	1979–1982	n/a	n/a
55-103	1979–1982	30x42x10.5	n/a