A10 specs

[Glover]

How can I find engine specs , is there any good books with it  in ? What are the standard size of large journal crank big ends please .

[Nanonevol]

What year?  Cranks don't have big ends, con rods do. Probably 1.8435"

A real good book would be the BSA manual.  Google it.

[Pete A10]

If you go into the Members Section on the website you can download service sheets. Sheet 702 gives info on crankshaft dimensions which may be of some help to you

[chaz]

I would think, cant remember!!, Roy Bacon's book on the BSA twin should have a lot of information as would the haynes and BSA own manuals. the factory manual would probably be best