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B25 / Tr25 Oils ?

furse
in Classic Trials

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Hello, can someone tell the type and capacity of oils for a BSA B25,

Thanks in advance.

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    • 4 weeks later...

    I've a C25 (same as a B25 to all intents and purposes) as a road bike.  I run on 20W50 classic motor oil for the engine and primary cases.  Gearbox is a 80W90.

     

    I wouldn't have thought the gearbox oil would change in a competition bike, but depending on whether you're running an oil filter or not you may be best running on a modern engine oil. What set up do you have?

     

     

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