the red lawn mower started life as a normal production lawnmower. apparently the original motor quit working because we found it in a dumpster. we chopped off everything that wasn't needed. and put on a worn out 5hp Honda motor with a simple centrifugal clutch and a differential drive axle. it went about 50 mph. when that motor quit working it sat out in the back yard for two years until we bought a 2hp electric treadmill motor. that combination only went about 15mph because the frame was so heavy. that sat around for about 4 years until we got the 15hp vertical kohler engine and the techumseh transaxle. which gets us up to now with the modifications to the engine to get 120hp.