I am pretty sure one of these will work on your lifan:D
50cc Daytona DOHC Conversion Kit - crf50 - ttr50 - xr50 - klx110 - drz110 - mini bikes - pit bike - big bikes - parts - products - racing parts - racing products - performance products - 50 - 88 - 110 124 - 134 - cc - Red Baron Racing