Collector Inspector wrote:6 x 6 S!
304 has the same ring pins.
Con-rod as yours. Ugly but very sturdy.
Piston skirt is 2.2525"
Piston pin height = to BS.
Exhaust tube is exactly 15".
Exhaust port has a bridge.
BS style drive shaft. Fits over 0.37" square section.
Whitworth fasteners inc coarse threads.
They spared no cost saving measures with these. Hardware shop stock items.
Crankcase and cylinder were silver frosted.
Gearbox/WP housing as well.
Was going to make a correction about the threads but you beat me to it B.
Bought a BSW / BSF thread gauge yesterday and confirmed threads are in fact BSW.
Interesting that UNC nuts fit easily, but I tried the reverse also and find that BSW nuts will bind against UNC threads. Pitch must therefore be same, but with different angles. Learn something every day.
B, please measure ring gaps when positioned towards spark plug end of the bore and advise. I will be doing same.
Am finding it difficult to accurately measure pun diameter with my limited tools.
Charles, you've asked a lot of questions which have been answered. I've asked one of you re ring gap and have got zip in return. Please, if you could share your thoughts, it would be much appreciated.
Thanks & Regards