East 50's sell a kit for the lifan 125 but Brian told me himself that it is a waste of money. They are claimed to be 138cc but are truly 127 cc and lifan 125's are actually 120's so your only getting 7cc's extra which isnt worth the cost. Brians exact words were " just flog the sh*t out of the 125 for a while and buy a 140 to bolt in it". Another option is if your motor is good sell it for what you can get and put that money towards a 140.