In 1981 Yamaha was ready to introduce an all new TZ250. Known as the TZ250H, this design incorporated the powervalves found on the 500, providing more of a sensible balance between power and reliability. The new engine ran backwards from the previous design, helping even further in reliability. The single casting crankcase was replaced with left and right case halves and power was then tapped from the center of the engine. This design yielded a lower piston speed resulting in less bottom end problems. The powervalves employed a mechanical-governor design which kept them closed up to 8,750 rpm, opening fully by 11,000 rpm. This allowed a free flow of all exhaust gases.
This example produced in 1985 is one of the last models with a steel frame. Presented in good all round condition this example comes complete with paddock stand and has recently been recommissioned where work has been carried out to the engine which has had just 1 hour of running in since a rebuild.