interesting to see those engines . i have a set of hard rubber tires and have no idea what they fit on . perhaps they are military . i also am neighbours with a fellow who collects old equipment . he started up a tractor built in 1913 for our work crew as we were putting up a shed for him. a huge two cylinder machine that burned fuel oil. to crank it over he placed his foot in a flywheel and gave it a push downwards and the old engine came to life. it ran around 250 to three hundred rpm. i am amazed at the machinery that was built years ago with what they had to work with .