Gas Motorized bicycle's The gas tank in the kits are crap so i put 3Lts ones on instead and i put a head lights and tail light on. The 3 lt and lights are modifications which cost more if you want to take your chances without then you can And i will still make it. The costs is the total of the bike,gas tank,engine kit,and the lights. Also if anything goes wrong I will fix for free unless it needs a new part if so just the cost for the part and i will attach it for free. Cost varies on if u have sutible bike or if I have to get everything for it. The cost if i have to get everything is $333. For information just comment, private message me here or text/call. Number is 724-496-5069.