Re: 'The (almost) everything was not right bike'
OK, here I am, seems my fix is working real good, I have no chain issues at all, went to my brothers place about 3kms away.
Kept the motorized bicycle a secret from him all winter, now he wants one, he took it for a burn and could't believe how it could move!
So here is a pic of what I did, finally found a use for that hunk of rubber I found.
The rubber acts as a bumper to stop the upper chain slack that got bound up in the drive sprocket.
See, sometimes crap I bring home does get used for something.
Yeah I know, looks even more over-complicated, but it works for me.