thanks rob, next on my to do list mate.
looks like there is also going to be crankshaft and shell issues now,
.
solved one question though, SP4 and SPS have same heads and barrels,but SPS has the corsa crank and gearbox. But one odd thing has come to light,the valves I've measured this afternoon are not the same as the stated ones (SPS 30/34)that should be in the bike, so something amiss here to start with.
I am begining to think this bike was upgraded by the previous owner just after he bought it, although documentation does not mention any engine mods, but then it is mostly all in Italian
but will have to triple check just in case.
speak to you soon rob