MikelT,
K&B engines are now being manufactured by another company and I had hoped to get an address for you before I started this but came up empty. Maybe another RCU member can provide that info.
As previously mentioned the .28 and the GP SloPoke was a great combo. I made a change in the wing however, by dropping the dihedral of the outboard tips a mite and adding ailerons. That made a fun plane even more fun! At full throttle it moved around like a .40! Slowed down it would putter around all day, and on landing would sneak in and touch down like a feather but under full control. It is an easy kit to build, looks and flies great. That K&B engine just kept getting better and better the more it was flown. What else can I say? I liked it.