With Harley-Davidson pumping WR racing motorcycles into the market, Indian needed
something to keep its hand in the game. The Wigwam was focused on building the
new lightweight model line, and very little money was available for a racing program.
With relatively little investment, the Model 648 Scout was developed.
It got its name from a big crankcase with a larger oil sump and the use of
Model 841flywheels from the 90-degree V-twin experimental military model.
Only about 50 648 Scout engines were assembled and exactly how many complete
motorcycles is not known.