I have stripped them both down and replaced bearings and seals because they have both been unused for many years, however attempts to find any source of pistons or even rings was unsucessfull. Fitted new mikuni carbs as I am not a fan of the mk2 amals and they run realy nice no rattles etc. My main corncern is the gearbox as one of them shows signs of wear.
I have tried the usual suppliers, sandifords, mainly spanish, Bultaco uk, none could offer a piston or rings for the 242 so no chance of gearbox bits, it seems that 248 and 247 cotas are a bit easier to find parts for. Should I be looking abroad if so any contacts would be appreciated.