Well took the plunge and went for the v1.0 M7 WCS as my kick off engine (the local shop here have been great helping me get set up and done a good deal so all good). I've looked at the schematics of the v1.0, 2.0 and 2.1 and with the exception of the front bearing the core engine bits have all the same part numbers, so I'll upgrade it once I've got my eye back in. Does look like bore and stroke is the same (I would have thought part numbers would have changed if this modified?). The engine was a 'broken in' version, well cleaned and oiled after so hopefully it'll be a good lump. Workmanship on the manifold and pipe looks great.

So anyone got some experience on these? Seems a bigger following off road?