Thanks WT1, I must admit i'm not a thrasher through the gears. tbh the Gori kit is literally sold as 'not a fire breather' - i wanted a 175 with relevent piston so as to have a thicker barrel and be (maybe) more reliable.
Thanks Phil D, yes yours seems exactly like mine. it should be off the clock on my 80kph speedo...
Now that I know that it's a bit slow I will recheck everything I can then see about getting it to a mechanic again. it had a bit of a kick in since the dyno from burglars a few weeks ago (it was kicked over and got a bit dented) but I checked the exhaust nuts (just in case) and re-oiled Etc.
Best A