In 1949, an assembly cooperation agreement was signed with Fiat in Turin. In 1943, an underground factory for the Steyr-Daimler-Puch company was built in Gusen. Some parts of the quarries were converted into a Mauser machine pistol assembly plant. The list of companies using slave labour from the Mauthausen-Gusen camp system was long, and included both national corporations and small, local firms and communities. Puch is on Wikipedia's list of companies using slave labour from the Mauthausen-Gusen concentration camp system.
In the three original assembly halls, luxury vehicles for the American market were produced. The existing capacity was insufficient, therefore a second plant was constructed and opened in 1941 in Thondorf, Graz. Like all enterprises of its kind, the Puch production plants had to change to arms production during World War II. This company in its turn merged in 1934 with Steyr AG to form Steyr-Daimler-Puch. In 1928 the company merged with Austro-Daimler and became a part of the new Austro-Daimler-Puchwerke. In 1923 the double-piston motor was patented. However with the collapse of the empire following the War, the market for automobiles shrank and production was discontinued. During World War I, Puch became an important vehicle supplier to the Austro-Hungarian Army. In that year the company employed about 1,100 workers and produced 16,000 bicycles and over 300 motorcycles and cars annually. In 1912 Johann Puch went into retirement and became the company's honorary president. In 1912, the 38 PS (horsepower) Type VIII " Alpenwagen" was developed. In 1910, Puch even produced sedans for members of the imperial family. In 1906 the production of the two-cylinder Puch Voiturette began and in 1909 a Puch car broke the world high-speed record with 130,4 km/h. Production of engines was started in 1901 and cars followed in 1904. The main production plant, later called " Einser-Werk", was constructed in the south of Graz, in the district of Puntigam. It soon began producing motorcycles and mopeds.
Puch's company became successful through innovation and quality handicraft, rapidly expanding over time. Ten years later he founded his company, "Erste Steiermärkische Fahrradfabrik AG" (English: "First Styrian Bicycle AG"). It does! But multi-speed transmissions cost money and add complexity, and old mopeds were designed to minimize cost and maximize reliability.Johann Puch first produced bicycles in 1889 in a small workshop called " Fahrradfabrikation Strauchergasse 18 a" in Graz. I don't know your moped, but if it's a single speed than it's not surprising that it would rev up and sound like it needs another gear.
The high-octane fuel will not harm your engine (although it will make a dent in your wallet over time), but won't provide any benefit. You can use synthetic or ordinary two-stroke oil. The choice is yours, but the answer is, I think, obvious. The risk of the former is a fouled plug and particularly stinky exhaust (either of which is easily enough diagnosed and corrected the next time you mix gas). Some 'peds take 50:1, some 40:1 and yet others take 33:1 (like my 1977 Minarelli-engined vehicle - although there's even some debate about that!) I would think it's a better idea to use too much oil than not enough.