Hi Dan
It depends...
The Lifan GY-3 that I know of has an almost "Horizontal" engine in it. In the USA they had a 70GY-3, 90GY-3 & a 110GY-3 that are all copies of the oh so famous Honda Trail70, CT70, DAX70, DAX50.
Unless your engine is almost "Vertical", the book I posted is the one you want.
Thanks, Bruce
Endless Journey Cycles
330-274-0098
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Dealer for: Lifan Motorcycles & Scooters.