I have a mini pocket bike bout 5 years old. I want to remodel it cuz it fell apart. im going to take off the body kit, and use the original frame to start over. but theres a few problems. the good thing is the engines a pull string but the bike also came with a key to turn the ignition on, i was wondering if i still needed the key to start the engine or if it would work with just the pull string im not exactly sure what the key's involvement in all of this is cuz i know its not the electrical system cuz the battery is dead and the battery is only needed for the lights and to glow everything like the speedometer n fuel gage..but anyway my question is "DO I NEED THE KEY TO START THE ENGINE, AND IF SO HOW DOES IT WORK?"