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This series of photographs show a very interesting
Yamaha 350 two-stroke twin engine racing bike. Curtis Racing Frames did
a lot of work with Fred Deeley Yamaha Ltd. (which later became Yamaha
Motor Canada Ltd.)
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Steve Souter on the bank during the Novice race at Daytona in 1974
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See ARTICLES Page for the image of the article.
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Our shop in Richmond was just around the corner from
the Yamaha Canada Racing department. The Yamaha race director gave us
work to do and supplied a lot of trick parts to look and work with. We
wanted to build a showcase bike featuring some of the latest suspension
ideas with low weight and low centre of gravity that might be of
interest to Yamaha Racing and privateers alike.
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I designed this racing frame to use the new liquid
cooled Yamaha engine very early in 1973. The engine was not at that
time available to the public and the wheels shown are the mag wheels
Curtis Racing was producing at the time. The bike was designed to use
18" wheels, Ceriani Road Race Forks and a cantilever swing arm with 2
shocks horizontally placed right underneath the gas tank. The engine
sat 1.5” lower than on the stock Yamaha model of the time. The seat
height was extremely low, keeping the rider's weight as low as
possible, and the gas tank was made in 2 halves and fitted together
pannier style. The bulk of the gas in the tank was placed below seat
height and just above the float-bowl height of the carburetors. The
bike was finished off with a Don Vesco race fairing and seat and
weighed 22 pounds less than the Yamaha Motor Canada bikes of the time.
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We showed the bike to Yamaha and a lot of interest
was generated, but they were contracted to use original equipment and
as a result were unable to commit themselves to the project.
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Steve Baker of Yamaha Motor Canada never did race
the bike, but did use some of the Curtis Mag Wheels at Daytona in the
early 1970's. Three frame kits were made and one was raced at Daytona
by Steve Souter of North Vancouver. In testing and in race conditions
all who rode these machines were very impressed with the light weight
and superb handling.
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Notes: The cantilever swing arm idea and two shocks
laying horizontally came from Vincent motorcycle suspension ideas, and
the 2 pannier-style gas tanks came from having seen the works Norton
Lowboy of the 50's and the AJS Porcupine racer of that same era.
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