Pat Miller’s triple-engine Yamaha
Motorcycle drag racing is
mysterious, even among motorcyclists.
The sport hides in a corner of the two-wheeled world that few riders
know much about. Yet it is one of the most inclusive motorsports (or any sport)
around – riders of all ethnic backgrounds and genders have been successful at
the highest level. Whatever your perspective, the machinery of drag racing is
clearly impressive.
Underdog innovation is at the
heart of it. The parts required to
create, harness, and apply horsepower are so specialized they are often
homebuilt or adapted from other applications. To hurtle down a ¼ mile track racers began with single-engine
machines, then turned to double-engine machines. By the late Sixties there were
even a handful of triple-engine drag racers competing. But shortly thereafter
drag racing returned to a single-engine sport, which it remains today. Virtually
none of the late-‘60s triple-engine beasts are known to still exist.
One survivor is this B/Gas
Yamaha of Pat Miller. Miller first built and had great success with a single-engine
Yamaha 350cc two-stroke. He then added a second --also successfully-- and
eventually a third. The engines are Yamaha TR2 350cc factory road racing
motors, generating roughly 60hp each. The bike also features one of the first
slipper clutches used on a motorcycle.
An enormous trail bike
sprocket was incorporated to compensate for the limitations of the four-inch
Avon slick. And not always effectively: the machine would often smoke the tire
for the entire quarter mile. Regardless, its best time was 10.09 seconds at 144
mph.
Look closely at the build
details of the bike: each motor’s
transmission has been sawed away, the headstock is integrated into the tiny
fuel tank, the rear axle carrier mounts to the frame with just four 6mm bolts
on each side. This is a bike that rewards study.
Thanks to the NHRA Museum
in Los Angeles for the loan of this motorcycle. The bike’s current owner, John Stein, recently authored Motorcycle
Drag Racing: A History. Copies of this highly acclaimed book are
available for purchase here at the Graeter Art Gallery.
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