Helkama Oy built a series of mopeds from the 1960s to the 1990s using the brand names Hopeasauma, Hopeapääsky, Hopeasiipi, Sisu, Vasama and Helkama.
The best known Helkama was a 49cc trials machine named the Helkama Raisu, powered by Minarelli. This was replaced in the late 1980s by the AX model.
Well known for their bicycles, the firm is quite large and has constructed shipping cables, refrigerators and other household appliances, and also imports and distributes automobile parts and accessories.
Sources: Wikipedia Finland, et al
Vasama was another marque built by Helkama Oy. In 1961 there were 50cc and 75cc models. The 50cc machine had a high exhaust and a Demm engine.
In his youth, World Motorcycle Trials Champion and ISDT winner Yrjo Vesterinen rode a 1967 50cc Vasama trials machine.
Manufactured by Helkama Oy, these were powered by Zweirad Union EM50 engines which were also exported to Finland and sold under the name Sisu. The mopeds appear to have been available only in the years 1960 and 1961.
It is unclear whether there was any relationship with the Finnish firm Suomen Autoteollisuus Oy, builder of Sisu trucks and other heavy equipment since the 1930s, but it seems unlikely. Apparently the word "sisu" has a special meaning in Finnish. It translates directly as "go", and its synonyms are "vigour, enthusiasm, courage, vitality".
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