Jon;
Sure enjoyed those videos. What I saw in starting the 30-60 though was the man put his foot on a spoke of the fly wheel & rolled it over, didn't see any flat belt involved. I have hand cranked a model D JD with a 6 3/4" bore by 7" stroke for 501 CID. Unless your name is Hercules you'll open the compression relief valves. I feel sure the Rumley had them also & of course it had a much larger flywheel for better leverage. The Rumley had higher compression ratio than would normally burn kerosene so they had a water injection system to cool the fuel entering the cylinder. Love to hear those ole 2 cylinders with opposed crank run, especially under a good load. My greatest remembrance of them is of course the John Deere's which were built from the 1920's up to 1960.
PS; For some of you nit pickers we are talking "Double Barrels" here.
