Are 4 Stroke Bike Kits better than 2 Stroke Kits Let s find out Dirt bicycle motorized 49cc 2-stroke gas petrol bike engine motor kit scooter specification cylinder numbers single cylinder stroke 2-stroke gas-oil mix rate 251 bore 44mm gear box reduction rate 3.1 1 displacement 49cc start way recoil pull startnew style recoil, easy […]