SOHC.co.uk Forums > CB500/550

O ring seal question for 500 cylinder bores?

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McCabe-Thiele (Ted):
The four cylinder bore block seals part number 91304-286-00 are shown in the parts book as 61.8 x 2 mm.

I have a set in my engine gasket set that fit nicely - they are black - on checking my disassembly photos the originals were a sort of orange/light brown colour.

Is this due to an upgrade in the materials used or ought they to be orange?

AshimotoK0:
Fitted mine last night to my 500K0 engine and they were black. From a quality pattern gasket set Bryan kindly sold me ages ago when I first got the bike ...if they are good enough for Bryan they are good enough for me.

Oddjob:
Also seen them in green Ted. They'll be fine.

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