In 1946, Soichiro Honda had absolutely nothing left except the idea that powering a bicycle with a leftover army engine was going to work. The destruction of his prior business had been comprehensive. Honda’s previous company, Tokai Seiki (Eastern Sea Precision Machine Company) — which he had founded in 1937 in his hometown of Hamamatsu and which had spent the late 1930s and early 1940s producing piston rings as a Toyota subcontractor — had been destroyed in two separate disasters. The Yamashita plant had been bombed in 1944 by a US B-29 strategic bombing raid. The Iwata plant had collapsed on 13 January 1945 in the Mikawa earthquake. By August 1945, Honda had no operational manufacturing capacity. He sold the salvageable remains of Tokai Seiki to Toyota for ¥450,000 — approximately the equivalent of $30,000 in 2026 purchasing power — and used the proceeds to fund what was, by every reasonable measure of postwar Japanese industrial circumstances, an unlikely speculative restart.

The post-1945 Japanese economic environment that Honda was attempting to enter was, by every available account from the period, substantially restrictive. As described in an Association for Asian Studies academic analysis of Honda’s role in the broader rise of postwar Japanese motor-vehicle manufacturing, the Allied General Headquarters under American General Douglas MacArthur had imposed strict caps on Japanese vehicle production — limiting the country to a maximum of 1,000 trucks and 350 passenger cars per year, essentially all of which were allocated to maintenance of basic civilian services rather than to consumer purchase. The Allied authorities had also explicitly forbidden the production of motorcycles and scooters, on the grounds that such vehicles were “useless toys” rather than essential transportation. The prohibition was partially lifted in 1946 following a public protest at the Imperial Palace by Japanese manufacturers who wished to convert their wartime production facilities to civilian motorcycle production, but the broader scarcity of materials, fuel, and capital made motorcycle manufacturing substantially difficult for even the established firms that received production authorisations. Bicycles, by contrast, were widely available, widely used, and unrestricted. The average Japanese citizen in 1946 commuted, transported cargo, and ran essential errands on bicycle — typically with substantial physical effort over long distances and across the substantially damaged road infrastructure that the war had left behind.

The engines that had been powering radios

Honda’s substantive insight was that the gap between the bicycle and the automobile — the small motorised vehicle that could substantially reduce the physical effort of daily Japanese civilian transportation while remaining affordable to the post-war population — was a market that essentially no one was currently serving. The technical problem was finding engines small enough, cheap enough, and reliable enough to power a bicycle without exceeding what the Allied authorities would permit or what the average Japanese consumer could afford. The solution Honda identified was the substantial supply of surplus 50cc two-stroke engines that the Imperial Japanese Army had used during the war to power field radio generators — small portable units that provided the electrical power required to operate the wireless communications equipment that connected forward Army units to higher command. As detailed in Honda’s own corporate heritage archive on the 1946 encounter with the surplus military engine, the Tohatsu-manufactured engines had originally been mass-produced for military communications applications and were, by 1946, sitting in surplus stockpiles with essentially no military purchaser and substantial physical availability through the postwar Japanese scrap and gray markets.

Honda acquired approximately 500 of the engines. He modified them with rubber-roller drive mechanisms (which initially did not work), then with various belt and chain drive configurations attached at different positions on a standard civilian bicycle frame. The first prototype was tested in late summer 1946 by Honda’s wife, Sachi, who rode the modified bicycle around the streets of Hamamatsu and returned with her work pants substantially soaked in oil from a carburetor backfire problem that subsequent prototype iterations corrected. The product was released for commercial sale in October 1946. The response from the Hamamatsu civilian market was immediate. The auxiliary bicycle engine substantially reduced the physical effort of daily transportation, used minimal fuel (at a time when fuel was severely rationed), and was affordable to a population that could not afford either a motorcycle or an automobile. The 500 surplus Tohatsu engines were consumed by demand within approximately 18 months. Honda then began manufacturing his own copy of the Tohatsu engine — the Honda A-Type, released in 1947, nicknamed the “Bata Bata” for the sound it made and “The Chimney” for the substantial quantity of two-stroke smoke it produced — and supplied the engines directly to customers for attachment to their own bicycles.

The 78 years that followed

The trajectory between the 1946 bicycle-engine workshop and the present-day Honda Motor Company is, by every reasonable measure of postwar industrial development, substantially difficult to summarise in the available word count. As reported by EBSCO Research Starters’ biographical entry on Soichiro Honda and the founding of his company, the formal Honda Motor Company was incorporated on 24 September 1948 — two years after the original Honda Technical Research Institute — with an initial capitalisation of ¥1 million and 34 employees. Honda joined forces with the businessman Takeo Fujisawa, who took responsibility for the financial and commercial operations of the company while Honda focused on engineering and product development. The first complete motorcycle — the Honda D-Type “Dream,” with a 98cc two-stroke engine producing 3 horsepower — went into production in July 1949 and became a substantial commercial success in the Japanese domestic market. By 1952, Honda Motor Company controlled approximately 70 percent of the Japanese motorcycle market. By 1959, Honda became the world’s largest motorcycle manufacturer — a position the company has maintained continuously for the subsequent 66 years.

The cumulative production figures, set against the substantial improbability of the company’s 1946 origin, remain difficult to grasp at scale. Per the AMA Motorcycle Hall of Fame’s biographical summary of Soichiro Honda’s career and his company’s subsequent global trajectory, Honda Motor Company has produced approximately 500 million motorcycles since 1948 — more than any other manufacturer in the recorded history of the global two-wheeled vehicle industry. The Honda Super Cub, introduced in 1958, has become the most-produced motor vehicle of any kind in human history, with over 100 million units manufactured and continuing production in essentially every developed and developing market on Earth. Honda is currently the world’s largest manufacturer of internal combustion engines by unit count, producing more than 14 million engines per year across motorcycles, automobiles, marine vessels, lawn equipment, and electrical generators. The company’s market capitalisation as of 2026 is approximately $32 billion. Soichiro Honda himself retired from the presidency of the company in 1973 — exactly 25 years after its founding — and died of liver failure at the age of 84 on 5 August 1991, days before the Hungarian Grand Prix, where the Formula 1 driver Ayrton Senna won that year’s race in a McLaren powered by a Honda engine and dedicated his victory to the memory of the company’s founder. The 39-year-old former mechanic who, in the late summer of 1946, had begun bolting Imperial Japanese Army surplus radio generators onto civilian bicycles in occupied postwar Japan had, in the 45 years between the founding and his death, built the company whose name now appears on more motor vehicles than any other manufacturer’s name in the recorded history of the industry.