125cc

So I decided to go ahead with the 125cc lifan build. Engine and a few other parts arrived today, holy crap the engine is massive! Micargi puma arrives tomorrow. Then I can start figuring out how to mount the engine. Going to gear it for a top speed of just over 60 mph at 9500 rpm in 4th gear...

So I am building a 125cc lifan bike, and I am trying to figure out what a good gear reduction would be. The engine itself has internal gear reduction, 4 speed. 1st gear is 2.833:1, 4th gear is 0.958:1. I was thinking about 12.5:1 gear reduction after that, which if my calculations are correct...

So I currently have a single speed 79cc predator bike that can do about 40 on level ground, but I would like a bigger, higher quality engine. I was thinking the 125cc lifan would be cool to build a bike out of because of the built in 4 speed transmission. Only thing is that the engine is about...

Hey guys i have a 212 predator engine without the governor.... and gear ratio goes like 9-22-11-56 using the #410 or #415 i believe but since it is rated for 3600 rpm i don't rev more than 4300 rpm which gives me 26 mph i want to upgrade it with the lifan 125cc 4 spd manual engine but i am...

I recently bought an XL chopper and i wanted to put a lifan 110 or 125cc engine on it. But after going to the local ATV store today to look for a possible rear wheel & tire upgrade & ask questions about motors. The guy at the store told me that i should just get a 50cc motor because it offers...