Found a ducati's website info about 851's. 888cc were made in 1990 due to WSB Homo. Earlier models were just 851 cc single seat's.
As per my 1989 851, the earlier 851's ran a different crack spindle for the sprag clutch. needed to purchase a monster one.
http://www.mbracing.pwp.blueyonder.c...otorcycle.html.
£2500 - £3000 for the adverstised bike not £6k.
PS I'm still wanting a 851 someone most have one for sale below £3200