Bridgestone and Suzuki 50 cc twins

Here we have some pics of two very rare 50cc twins, the Suzuki RK66 and the Bridgestone EJR50.
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Bridgestone and Suzuki 50cc twins

Kawasaki fourcylinder prototypes

This time some rare pics of two fourcylinder twostroke prototypes made by Kawasaki. The racer is an inline four with a staggered cylinder layout to make the engine smaller. The road bike is an squarefour. Both bikes don't exist anymore. The frame of the racer is still in use, now with a KR750 triple in it.
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Kawasaki fourcylinder prototypes