Re: Chain Tensioner/Guide
If it were me, and if it is a coaster brake type bike. I would set the bike rear wheel for the motor chain without the tensioner, then put the tensioner on the bike chain with just a bolt and nut to hold the wheel in place. Since the bike chain will get very little use ,all it will do is keep it tight. It won't need to spin.
My posts have entertainment value only. A bike ain't yours till it has your blood on it. Then it owns you.