I posted this query on the AOMCC forum but am a bit uneasy with the reply, so would appreciate another opinion:
I bought a 23 tooth sprocket to replace the 19 tooth one on my 1950 VB; but having dissembled the primary side, I find that the lobe profile is not the same, so it doesn't match up with the shock absorber/sliding member. The lobes are different widths and have a different curvature - the load bearing surface would be much less. I gather the 23 tooth sprocket is probably for an earlier (pre 1945 Ariel).
This video shows the issue:https://youtu.be/LC15GBjO9u4
My question is: am I safe to fit this on or not ? I've been told - yes, people have done this, but I'm concerned. There is very little contact surface so it will wear rapidly - but is it likely to be able to perform correctly and transmit the engine power safely ?
Or should I admit I stuffed up and get a suitable sprocket made ?