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It appears that Yoshimura was the designer of the z400 series of motors - not sure if the LTZ motor was also designed by Yoshi (adding reverse and making modifications to allow the higher motor angle in the LTZ), But I assume so.

"We first heard rumors about the Suzuki 400 about a year ago with our source claiming that the Japanese factory charged road-racing specialists Yoshimura R&D of America with developing the motor.
Apparently the rumors are true. Also present at the Soboba intro were Brant Russell and Don Sakakura of Yoshimura, which used its head start with the DR-Z to develop a line of exhaust systems as well as titanium fasteners, brackets, subframes and engine internals plus other engine hop-up parts, services and carburetion. Kiedrowski will be relying on Yoshimura for many of the modifications on his race bike.

For information, contact Yoshimura at 4555 Carter Ct., Chino, CA 91710; 909/628-4722 or visit "
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