bsa 1934 blue star 350cc help with oil capacities please

[chris sloper blue star]

hello guys hope you can help me please?

Can someone confirm  the gearbox oil capacity and also the engine oil capacity or a manual on this bike please,I could do with some info asap because im on a wmcc run up  in burton up on trent on sunday and my old girl hasn't been in life for a long time nearly 20years , unfortunately working full time gets in the way Im 45 maybe so quite young to be messing with old bikes but someones got to try and keep them going     thank you in advance Chris

[David Samways]

I don't think BSA published a contemporary volume for the gearbox oil. The M21 - which used a very similar gearbox- specified 1 pint.

However, the gearbox has the correct amount of oil when it is level with the filler spout.  BSA specified engine oil to be used, but thixotropic grease has been recommended on this forum as providing adequate lubrication without leakage - I've not yet tried it myself.

If you go to the club literature pages you'll find a handbook or if you PM me I'll email a copy - it's too big to attach to this post.

David

[chris sloper blue star]

Thank you David very much appreciated,I'm sorry but I'm not sure how to PM you I'm still in the steam age with technology but could do with the manual if you would mind please thank you Chris

[David Samways]

Hi Chris, if you post your email address I'll send the manual.

David

[Steve.S]

The 1934 BSA Sales Brochure states that the engine oil capacity is 3 Pints, but since there is a dipstick on the filler plug, you could use that.
It seems that BSA never quoted the oil capacity for the gearbox. The gearbox is the same as the early hand change M20, but later one's has a different outer cover for the foot change, and moved the filler to the outer cover.
For your information, quoted  capacities for the M20 are all over the place. Haynes state a capacity of 570cc ( 1 Pint ), but then say "Actual capacity 398cc", whatever that means?  The M33 riders book stated 370cc. Castrol Chart shows 398cc.
I did find in one of the BSA handbooks, that the Blue Star gearbox should be filled to 1/2" below the top of the filler with 50 Grade Engine Oil. I found that equated to 450ml. Other books just say fill the gearbox up (presumably to the top).
So if you fill it to the top, or 1/2" below, I doubt if it matters. It's your choice.
Steve.

[chris sloper blue star]

Thank you for your help 👍

[chris sloper blue star]

Hi David it's Chris_elec77@yahoo.co.ok

Also does anyone have a wiring manual please for the 1934 blue star thank you 👍

[Sabre]

I used this diagram on my 1934 350cc Blue star.