im trying to find the address for you, The shop is called NBS Motor (in English translation). It is a bit out of town, by the power plant.
I met a guy there called Andrey Anderson, who speaks English. If you do not have any luck on finding the shop on your own you could try emailing him on vf750(at)mail(dot)ru.
I just found their web site
Ìîòîöèêëû, ìîòîöèêëû Ìîñêâà, ìîòîöèêëû èç ßïîíèè - ÍÁÑìîòîð
they have a really good mechanic and shop. Andrey was amazing and really helped me out when I had a broken rocker. Parts sent from Moscow will take ages.
Good Luck - its the best place until Irkutsk then Vladivostok.
For more information on my adventures, please visit either of the following: