We had a BIG two cylinder John Deere that was our class project one year in auto shop. The cylinders were so big you could stick your head in um. In fact, that's how we magnafluxed the block. lol I remember it well. It just kinda went "bop bop bop bop bop" and slugged along, but that thing would pull a house down. It was also factory yellow and now green. Still stands out in my mind.