Had to do it after installing freewheel and breaking my pull start. It worked over and over, but it chewed up the nut and if I had any throttle, once the engine started it would unscrew the nut. Ended up buying a few spare nuts, without any more problems. Not that practical to rely only on drill start because if you engine dies and you don't have your drill with you, you're screwed.
Thanks for responding, guys.
I wonder if I could use a super long nut, then wire-wrap the bottom part of the long nut to one of the flywheel's fins.
I could weld a small washer onto the nut, at its base. After torquing the nut on, I'd wire-wrap it to a fin. There'd be enough exposed nut for the drill's socket to spin.
I'd want to carry a small cordless screwdriver on my bike.
It's not a perfect fit. The pull start is made for 54mm/23-29cc engines. The key part is the item which bolts onto the flywheel. That and the driver is all I need.
If necessary, I'll buy one and reverse engineer the thing.
After reading more about Craftsman and Troy-Bilt's JumpStart Technology, I realized the Troy-Bilt starter would probably not work for me.
The snout is too short, in case it needed to clear the pull start housing.
Really cool and like where you guys are going with this!
I have played with this but never got past initial, just using a drill and a purpose made socket.
But was thinking a sprag clutch arrangement. Have the starter above, below, in front or behind depending on the engine and a chain. With a solar panel so as not to rob the engine of any umph. (technical term) With an emergency way to wrap a pull rope. Might be mentioned in one of the very old threads.
It resembles a roller bearing but, instead of cylindrical rollers, non-revolving asymmetric figure-eight shaped sprags are used. When the unit rotates in one direction the rollers slip or free-wheel, but when a torque is applied in the opposite direction, the rollers tilt slightly, producing a wedging action and binding because of friction. The sprags are spring-loaded so that they lock with very little backlash"