This is my Weed Eater motor powered bike. It is friction drive, as you can see, and is mounted using steel. We were thinking about aluminum, but it might be to light and not strong enough. the drive shaft is on of the stunt bike pipes. The hardest part was the mounting technique, mainly because the motor hardly have any good mounting spots. Credit to my dad for helping with the mounts, and without using a welding torch! Enjoy!