Whilst I’m press hunting attention has turned to completing the sleeve drive. I haven’t bought any sprockets yet, but with an old one laid over the drawing along with some chain it began to get real.

Bob put the sprocket carrier / sleeve drive crank we made at the top and overlaid the oil pump and worm at the bottom. So the sleeve drive assembly looks pretty complete, certainly enough to see how it’s all going to work.

Some thought and effort has gone on in the background, working out how to set the valve timing. Then how to adjust the valve timing after that! Using 22/44 toothed sprockets and 3 fixing bolts, we’ll have a vernier adjustment to fine tune jumping a tooth.

Bob has devised a 9 hole mounting pattern that allows timing adjustment down to 0.9°. That should do it!