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Originally Posted by jkline805 hey i have the same Lifan big valve with the 124cm3 on the cylinder that turned out to be a 52.4x55mm, but the funny thing is, my engine # is 156FMI. I dont think that you can trust any of the markings on the cylinder and apparently not the model # either. oh well. |
Take a look inside your inlet port and IF the casting boss around the guide is a large diameter and the port is a smooth , clean finish , you have a genuine 120 "monster" motor . We have one of them and it is a 156FMI . I pulled the head off it new to check the bore to see if it was 56 mm but it was only 52.4 . The 124 big valve 1P52FMI motor turned out to be a 120 with ports that aren't as good as the genuine monster 120 !