[singleminded]

The sunbeam book I have lists 4 gearbox sprockets for the Model 9..15 tooth to 18 tooth..A 'standard' sprocket is not listed.
On my '32 9A I run a 24 tooth engine sprocket and an 18 tooth gearbox sprocket which seems right to me. If the gearbox sprocket was smaller I wouldn't need 1st gear. John

[matchlessg80cs]

Standard rear sprocket - Let me check & i'll get back to you !
Al

[singleminded]

What do you consider to be 'standard'?  John

[matchlessg80cs]

Hello - am after a 1928 Model 9 single port cylinder head with a complete set of fins (unlike mine which has had a hard life !), also a standard gearbox final drive sprocket in any condition - I can have new teeth welded on. Unf I re-geared mine a tooth up and its taken the end edge off its performance (they know what they were doing when they built these things !).
Many thanks
Al in Bristol