Fuel: The bike runs on alcohol-rich methanol, a common fuel for racers. Alcohol keeps the engine cooler than gasoline would. Methanol is cheaper, too-and at four miles a gallon, price is important.
Safety: Argyle ran the exhaust pipes coming down from the cylinder heads wide and close to the ground. That way, if the back wheel kicks out during a race, the large pipes will scrape against the track and stabilize the bike, enabling the driver to right it.