In addition, the cylinders received a so-called Yamaha Power Valve System (YPVS).

The fresh oil system provided by Yamaha was easily converted to mixed lubrication (1:20) by some private drivers.

The chassis consisted of a double-loop tubular frame with a telescopic fork and two spring struts on the rear swing arm.

With the model TZ 250 C (1975), the chassis was revised, and a cantilever swing arm with central spring strut and disc brakes were introduced.

In 1991, the engine of the TZ 250 was thoroughly revised and adapted to the factory racing machine (YZR 250).