Take a look under the seat of an older Yamaha G1 Golf Cart that has had the motor upgraded to a 420CC 13HP Predator Harbor Freight Motor with a few mods.
The G1 was originally powered by a 2 cycle gas engine with an oil injection system. The G1 body composition & gas engine underwent just a few changes over the 11 years of the production run. For the most part the engines and bodies stayed very similar throughout the G1 model design.