Bandito,
A go-ped is an excellent alternative for a pusher.
However, I already have modified the pocket bike frame to accomodate a 4 stroke set up (if that's the way to go).
If I go the 2 stroke w/pull start route, the pusher would no longer be required.
My reason for posting this thread was to see if using a fixed gear drive on the trike rear would work with a 2 stroke w/pull start; from what I can gather that is the case.
However, since I already have a 4 stroke Greyhound laying around and have modified the pocket bike frame to use as a pusher; I am going to try this out first. If that doesn't workout, I will definitely use the 2 stroke w/pull start and mount it over rear axle and hook up the chain to the direct drive. Due to ground clearance issues and the fact that drive sprocket is fixed, I won't be using pedals.