Bicycle engine kit, Bicycle Gasoline Engine kit, Bike Motor Kits, Motorized Bicycle kit 1. 48cc 2-Stroke 2. High Performance Low ... Idler 6. High Quality 202 Main Bearing 7. 415 Bike Chain 8. Upgraded Chain Tension Guide with Bearing Wheel ... . All the Needed Mounting Brackets, Gaskets, and Hardware32. Complete Color Easy to Follow Installation Instructions 2012 New Bicycle Engine Kit 48cc/Bike Motor