Hello, im new here so let me knoe if this is the right place to post. So I have a 25cc weed wacker engine Im putting on a 20in bmx bike. Instead of friction drive I actually attached a sprocket to the drive shaft. The motor is bolted into the frame. The pull start from the motor was damaged and removed. My question is if I run a chain right to the back wheel off the drive shaft mounted sproket with no pull start how could I start the bike?? Thanks for any help!