This type of engine has only one cylinder and will work best on little cc bikes. It can be cheap to take care of and resolve if something goes Mistaken. What's more, it produces high torque at reduced revs, which makes it suitable for off-road and commuter bikes. Example: Splendor, https://bikeenginedetails09754.ourcodeblog.com/35263468/the-definitive-guide-to-how-fast-does-a-212cc-predator-mini-bike-go