Circa 1931 Excelsior one-off racing engine. 21:35 cu.in. OHV single with dual port exhaust. Designed and built by legendary M/C racer, Joe Petrali for Ignatz Schwinn, owner of Excelsior-Henderson M/C Co. This engine was the 1931 El Centro National Championship winner in the one mile dirt track solo motorcycle race. It features a Schebler barrel valve racing carb and a German Bosch magneto ignition..
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