Product function description: Specification: 100% brand new. 49cc single cylinder Air-cooled 2-stroke Chain:T8F(NOT include) Fitment: Fits the majority of gas scooters, pocket bikes, and mini choppers configured with electric start. The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding. Package included: 1 X Engine.2 Stroke 49CC Engine Pull Start Single Cylinder for Pocket Goped Buggy Mini Bike. 49cc 2/Stroke Engine Single Cylinder Pull Start Mini Pocket Super Dirt Pit Parts. Fits the majority of gas scooters, pocket bikes, and mini choppers configured. If the items unfortunately don't work, or work badly, we have our engineers to serve you the professional help, otherwise we have many convinient ways to return the items. Plz pay attention to our Returning policy. For all problems, We will deal it in 1 day noramally(except Vacational days), not more than 3 days.