49CC 4-Stroke Gas Petrol Motorized Bike Bicycle Engine Motor Kit Scooter+Belt Gear (with Belt)

Engine works great and smooth, pretty quiet too. It does appreciate pedaling from a standing start to be less vibrating. Hills are no problem if you're approaching them with speed, pedaling helps too. But the engine definitely does the work. Unlike a 2 stroke I expect it to be very reliable, quiet and low maintenance for the engine itself.I had to do a lot of modifications, but that's because of my bike. Anyway on any bike I don't think it's plug and play, you will have to do some tinkering. For instance I had to bend the exhaust pipe with a blow torch.It even came with a fuel filter. I additionaly bought a sprocket hub clamp, a longer motor mount and a safer chain tensioner.Also I recommend the belt drive. I watched a lot of videos on how to install it.Ask me anything if you have questions.

Disappointed with this motor, didn't ride a good mile before problems with clutch or transmission and and the engine want idle, though the 4 stroke was better, i'm going back to the 2 stroke personally I like them better, buy a zeda or pk80 wildcat and you be good to go, I have own both engine and they ran great