BestBikeEngine.com has everything you need to motorize your bicycle or scooter and have fun. We sell top quality 52cc, 49cc and 43cc engines for bike engine kits. You can use our engines for any application that you may want to add some power to. Our Engines are great for motorized bicycles, motorized scooters, pocket bikes or any type of motorized hobby and sport. Our Engines have a centrifugal clutch that can be used in many applications. You only need a little creativity to adapt our engines to just about anything to get some power. Be safe and have fun.