Analysis of information sources in references of the Wikipedia article "Yamaha YA-1" in English language version.
There was great originality in the shapes of the pedals for gears, kick-starter, and brakes, which were designed with artistic curves. These design characteristics made the motorcycle more than merely a copy of a European motorcycle.
Nippon Gakki already had experience with wooden aircraft parts dating back to 1920, but wartime activity exposed the company to new technologies.
Though the YA-1 was itself a copy of the German DKW RT125 and was powered by a two-stroke engine, I am certain readers will agree the Yamaha concept has faithfully updated the YA-1.
The YA-1 was Nippon Gakki's (later Yamaha) first motorcycle. Like the Moegi, it had a single, 125cc cylinder, albeit a two-stroke.
This model was Yamaha's first motorcycle and the starting point for Yamaha Motor Co. Ltd.
Like the original YA-1, the Moegi runs on an air-cooled, 125-cc engine, which connects to the bike's 20-inch rear wheel with a simple belt drive.
The Moegi looks more like a classic bicycle than most scooters, but its decidedly high-tech from the handlebars to the tires.
They based it on the company's first motorcycle, the 1955 125-cc YA-1, but they also included some modern touches, in particular an ultralight frame and a new cylinder design that could help make the Moegi one of the lightest and most fuel-efficient motorcycles ever.
{{cite news}}: CS1 maint: unfit URL (link)This was Yamaha Motor's first motorcycle.
It wasn't a matter of remaking the YA-1 into a race machine, however, because the Mount Fuji Ascent Race was one for production models and the regulation left little room for modifications.
The bike was powered by an air-cooled, 2-stroke, single cylinder 125cc engine. Once finished, it was put through an unprecedented 10,000 km endurance test to ensure that its quality was top-class.