Re: A new shift concept for the engineers....
GhostO said, "Going with a derailleur on the left or right causes problems with a fixed rear sprocket and the want to bump start "
What if the engine had a pull start? That would ease things up a good bit on the sprockets and chain. I'm planning to install a pull start kit on the PK-80 anyway.
Yeah, wouldn't that be great at the bottom of hill to shift it down and climb right up to the top with no pedaling til your pants catch on fire, no tongue hanging out and no heart attack. I'm ready.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...