gday all , I have 2 yz250 jugs both are meant to be 1992 one is aftermarket I think as it has no casting numbers part numbers , and it also has different transfer ports , hoping some one can tell me what it is I have attached some pics now the one on the left in all pics is the unmarked 72mm big bore and the one on the right came off my yz250 which has yamy cast numbers and is 68.5mm bore and ported, both heads are side beside to compare , now I have been told by a few it maybe a yz94 jug but I am not surer as it has no markings and other says maybe its a ohlins or a yzr