In remarkable original condition! The "M" cylinders, developed by
the legendary Arthur Lemon, could be tuned for more power without
over-heating. A pair of "M" cylinders on the Super X crankcase gave
the 61 cubic inch V twin a major horsepower boost. This
modification was nicknamed "Big Bertha". Extremely rare because
very few of these factory-built racers were ever produced. William
V. Altman was part of the Joe Petrali team who won more than 31
consecutive hill climb competitions in 1928 and 1929.
1928 Excelsior Big Bertha
Location:Providence, Rhode Island
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