<!-- from fixya rte -->What is 2781 code 08 mini clubman ? - 2008 Mini Cooper Clubman

you can get guide from many sites.. i know few
error codes/ fault codes, wiring diagrams, schematic diagrams, torque specs, engine info, switches functioning, assemble, disassembly, complete refurbish, repair, installation every single thing is covered

Tune up would be the first place I would look into. All filters as well, air, oil, fuel.

in neutral tranny isnt engaged in drive it is u need to have your tranny checked first chk fluid if u can

Could be the computer did not like the change in ratio if the size of the tires are different. You would need to get the trouble codes checked to proceed.

Have it checked for a bad timing chain tensioner. It's very common on startup

I don't know of any that are free. Try this link:
http://www.amazon.com/MINI-Cooper-R55-Service-Manual/dp/0837616719

What do you mean by "center bore"
Bore X stroke on the old Clubman 1275cc (Engine codes 12A and 12 H) is 70.61mm X 81.28mm

There should be a reset switch. Consult your owners manual.