The bike is made in Czechoslovakia. There is a 2010 Yuki Darker model. It is a V twin OHC four stroke with carbs, disk brake on front, drum brake on rear, ( kind of backwards thinking ), CDI ignition, air cooled. Good or bad bike is irrelevant. Even if it is a good bike, where is your nearest service center? Do they have parts on hand or have to order from the factory every time? What is the warranty? When you sell the bike, will the new owner be close to the dealer? My personal opinion is that any motorcycle that doesn't have at least five dealers within 50 miles of where I live can be classified as a YUCCKY motorcycle. Best to go with a brand name; Honda, Yamaha, Kawasaki or Suzuki.
If you know it's the side stand switch, most switches are in and Open or Closed state. When the stand is down, I'm going to guess the circuit is open, and when you put the stand up the circuit is closed. It's one or the other right?
So if you're stuck, I'd first try disconnecting the switch and see if the bike starts then. If that doesn't work then you can try shorting out the switch so it closes the circuit and you can start the bike. I'm not familiar with the actual electrical socket on your bike but see if putting some aluminum foil across the prongs will close the circuit for you and you can start the bike? If that works, get a new switch. Good Luck.