The Yanmar Pony: the smallest diesel pickup that achieved 80 mpg and converted into a generator

Learn the story of the Yanmar Pony, the smallest diesel pickup ever produced, featuring a 358cc engine, 80 mpg performance, and the curious function of acting as a generator.

In the 1950s, the Japanese automotive industry was experimenting with ultra-compact solutions for rural work. The Yanmar Pony emerged as the smallest diesel-powered pickup ever produced by the company, created to operate in the field and, curiously, also serve as a generator when needed.

Born from an ingenious vision

Developed by the Ōhta Shōkai team, which also designed the Kurogane Baby, the Pony combined a virtually open cabin, a low bed, and an extremely compact diesel engine. The initial model featured a 358 cc V-twin engine capable of 6 HP, enough to reach a top speed of about 15 mph.

Specifications and performance

• Engine: 358 cc, V-twin diesel, 6 HP
• Payload: 300 kg (661 lb)
• Top speed: 15 mph
• Advertised fuel economy: 35 km per liter (approx. 80 mpg)
• Removable: the engine could be taken out to function as a generator or to power implements
• Launch price: 298,000 yen in 1959 (approx. 1,664,249 yen today, ~US$10,446)

Models and evolution

The Pony evolved into the FM, which retained the engine and gained a closed cabin, and later received the KYT version in 1960, featuring 9 HP and a payload capacity of 350 kg (771 lb).

Commercial performance and legacy

Despite the ambitious idea, the Pony did not take off. In total, only 1,000 units across all generations were produced, with about 650 sold. In 1962, production ceased and Yanmar's car division was closed. The Pony was created by the Ōhta Shōkai team, which also designed the Kurogane Baby.

Historical legacy

Today, even viewed as a commercial failure, the Pony is remembered as a precursor to diesel Kei trucks in Japan. Yanmar continued to establish itself as a manufacturer of diesel engines for agriculture, construction, marine use, and later, tractors, excavators, and UTVs.

Conclusion

The Yanmar Pony represents a bold bet: combining ultra-compact mobility, fuel economy, and practical utility in a minuscule vehicle. Although only about 1,000 units were produced, it left a trail of innovation in the history of Japanese light vehicles.

What aspect of this story intrigues you the most? Share in the comments if you have ever seen or would like to have a vehicle as compact and multifunctional as the Pony.