Isomoto is a tough marque to find information on. I found some, but I will not vouch for it’s accuracy. I usually like at least 2 citations.
“Renzo Rivolta built scooters and motorcycles including Isoscooter, Isomoto, Furetta and the Isocarro, the latter a three-wheeler. There was also a an Isetta microcar which was licenced to builders in several countries including France, Spain, UK, Germany, Belgium and Brazil. The BMW Isetta is by far the best known of the variations and built some 130,000 of them.” – from Sheldon’s Emu.
The Isomoto 125cc used an air cooled two stroke split single (twingle) motor that produced 7HP. A three speed gearbox and swing arm suspension with no visible means of support produced a top speed of 50 MPH.
This particular Isomoto 125cc is in St. Louis, MO and is listed as a 10,000 mile survivor. The pictures look really good, like maybe restored good. Offered by Michael’s Motorcycles, the bike has a starting bid of $4,999