Well, as I am still learning, all I can tell you about the engine, which has nothing to do with this thread about gas caps, is the engine I have came from BSA 7805, which is stamped on the left case and the rebuild plate on the right side of the head. There is a drain plug (hex head bolt) on the lower part of the left case.
Quest Master (I don't know your real name) You seem to be very defensive about comments made by some of us. For instance you said that your engine is not relevant to this thread, but you linked us to your website! I presume for some critique? Especially after the corrections you made about the Polish markings.
On this site (and many others) the threads can wander off in all directions. No one is out to piss on your firework, just give you the benefit of years of interest and knowledge on the marque. (over 30 years for some)
Thank you so much for all of your assistance and this wonderful forum! I look forward to more information as I learn about the M20 BSA world and the restoration of the M20 that I am working on.
