Honda-SOHC
SOHC.co.uk Forums => Project Board => Topic started by: Laverda Dave on July 24, 2017, 07:53:56 PM
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Hi All,
I am trying to obtain a couple of oil seals for the 250 rebuild. I have the old seals (they are for the kickstart shaft and the clutch operating arm) they are both the same inside and outside diameter but their markings differ? One is marked as C14 SD 12 X 22 X 5, the other is marked as C25 SD 12 X 22 X 5.
I have tried various oil seal suppliers (Simply Bearings is one) and they all have 12 x 22 x 5 oil seals of various prices ranging from a cheap eurobrand up to SKF at four times the price. Some are nitrile, some are vitron. None have the C25 SD or C14 SD on their description :-\
Can anyone advise what the C25 and C14 and SD marking actually mean?
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SD seals are a sort of double seal. Oil seal plus dust lip. Search SD oil seal. No idea on the C numbers.
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Thank you Seabeowner. I'll order these up.
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It's difficult to find any kind of definitive list that captures the coding around these things.
Some of the criteria appear to relate to things like shaft speed and surface finish etc, for example, a kickstart shaft having no real requirements to run at speed and duration compared to a crankshaft say. Also the level of protection for ingress of water dust etc compared to exit of oil from an engine would move towards a double lip seal would seem logical.
It's strange that it's not captured somewhere to make the decision more clear.
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It also appears to be a Yamaha part so should be Ok for your use
https://www.fowlersparts.co.uk/parts/view/93102-12106?gclid=CjwKCAjw2NvLBRAjEiwAF98GMWrmthV7SlsUf07iKSRdZpUAIrpCxdzRyAPix9CKAbBySd1DuRBCABoCHbsQAvD_BwE