Thx dave, yes its a small size plug, oh well it doesnt really matter as long as it goes eh?.
GOT NOWHERE AT FIRST (THE TEIKEI CARB WAS SHOT and there was a copper base gasket fitted that partialy blocked the transfer ports), new paper gasket and STUCK A TILLOTSON WITH A LARGER BORE, (ACTUALLY MATCHES THE REED BLOCK PASSAGE) and it seems to be running ok, very low on compression, but I think thats down to the newness of the internals, I can still see hone marks on the cylinder

oops sorry about caps lock