 54x54.4 BorexStroke disk valve induction through 34mm carbs 50+HP @ 12,000rpm 7 speed transmission 208lbs. This is one of approximately twelve bikes made that year. Raced by Yvonne DuHamel and Ron Peirce and developed by the US factory team for a few years. The single shock and belt drive are unique development changes made by Kawasaki in the US. The chassis was modified to the single shock you see here to improve the routing of the exhaust which originally went up and over the engine exiting on right side through the fairing.   The early versions of this powerplant were 180 deg cranks. This
arraingment had vibration so strong that it would blur the riders
vision! This bike was fitted with the later 360deg cranks which were
smoother running and also improved power. The team was forced to block
off seventh gear due to a rule change by the AMA, it's give and take in
the racing game.The use of magnesium parts on this bike, centercases,
carburetors and wheels help keep the overall weight down. |  The Morris Mag wheel was a great innovation of the time. Both strong and light.  A world champion in the making.
This bike ultimately became a real force in the world GP scene in both
250 and 350 classes. After a redesign in 1977 where the crank phase was
changed to 360deg.,a new ignition, revised rotary valves,exhaust pipes
and larger 34mm carbs brought a better spread of power and now made
55hp. A new chassis featuring Kawasaki's Uni-Trac rear suspension was
also introduced in Europe for 1977, some 40 examples were produced in
all. Development continued from 77 and a remarkable run of world
championships followed in 1978,79,80,81,82. |