furse Posted January 9, 2016 Report Share Posted January 9, 2016 Hello, can someone tell the type and capacity of oils for a BSA B25, Thanks in advance. Quote Link to comment Share on other sites More sharing options...
ringding Posted January 31, 2016 Report Share Posted January 31, 2016 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? Quote Link to comment Share on other sites More sharing options...
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