OK - I know its not an 851 /888 per se, but it did have an 851 heart originally !
This is the bike that I want to fit a 964cc motor to (see thread in Tech), but rather than bore you with a blow-by-blow account in-depth report, it's condensed to this link
http://www.bimotaforum.co.uk/viewtopic.php?t=1558
please feel free to delete if inappropriate - I am just trying to give people an insight into why I want / need a 964 motor.
Thanks
Garry.