Hello I am new to this board and I am glad I found it. I have a old mini bike (70's era) my son got from his friend that recently move away. I dont know anything about these engines (tecumseh 4 hp) but my question is how do you turn off the mini bike engine if there no kill switch (I do see a wire coming from the engine that may of been hooked up to a kill swith or ground or something to that effect that turns the engine off I know its not the throttle becuase it hook up and ready to go so I am guessing this other wire may of been the kill switch this is where I am depending on you guys knowledge here to lead me to the right conculsion). I know this may seem like dumb question to all you mini bike and engine experts but I wanted to try to find out before we start this engine up. Everything elese on the bike looks to be functional but if you guys can help me out it would be appreciated.