How is the Trans-Siberian highway in 2014?

We will be crossing Russia from Valdivostok to Saint Petersburg between mid August and mid Sept by motorcycle. Can you tell me if significant sections are unpaved. (I understand that a highway that length will always have sections under repair, but is it all paved?)

My research indicates we can expect some light rain almost half the month, but mild temperatures. Is that correct?

In the eastern half, I understand hotels are scarce. Is camping allowed?

Also, how can I find out about Honda and BMW motorcycle repair shops along the route (particularly the eastern half)?

Thank you, and what a cool website; lots of information.

Gary