I think you have just managed to maximise your visa expenses....The 72 hour rule that would allow you to cross CIS and former USSR states with a valid visa for the next is finished by all accounts. Eg going through Kygystan enroute to Kazakstan from Uzbekistan etc.
I am not aware of transit visas for Russia, but someone here should have some info.
Your best solution may be a multiple entry business visa and it may be the cheapest, othrewise its LOI's for every tourist visa for every entry.
You are given papers for the motorbike and must buy insurance at the border. The bike will have to leave with you within the time frame of your visa. You cannot leave without the bike in normal circumstances.
[This message has been edited by simmo (edited 21 April 2005).]
Close to Antarctica and a long way from reality