100cc Bicycle Engine Kit Single Cylinder 4-Stroke Gas Petrol Motorized Bike Engine, Air-Cooling Motorized Bicycle Motor Kit, Bicycle Motor Kit for Bikes with Large Triangular Frame Space (Belt Model)

I bought two. Took about 4 hours to install on my bike. You might have to take a few links out of the chain; it’s long. I’ve rode about 50 miles on it so far and the only issue I’ve had is the exhaust pipe. It sits directly in the way of my left pedal. Also, the bolt holes stripped so I had to tap and die new threads in the engine to secure the exhaust pipe. Also used high temp JB weld. Other than that, I’m very happy with the engine and my wife loves it. Runs great. Worth every penny.

When I was putting this thing together I didn't have much confidence in it But the damn thing works pretty good I'm impressed I have road it about 300 miles already it's been a lot fun I ride it about 50 miles round trip to my daughter an it still has gas now if I could get a seat that's a little easier on my ass every 55 yo should have one peace and Love to everyone

The installation directions need to be revised and the kit motor is a 66-80cc 2stroke. It's fine for beginners ⭐.

i had a bit of trouble understanding the instructions but it secures nicely to my bike and runs well. you get what you pay for, but you won’t be let down. better than i expected, easy to assemble and the price is good for what you get.