GEBE Link you asked for... Golden Eagle Bike Engines, Geared Belt Drive Bicycle Engines / Motors for Mountain Bikes & More
They are also backlogged as well. Everything EXCEPT the engine on their kits are American made. The two engine choices are both Japanese. I own two of them. A Robin/Subaru 35 CC 4 stroke and a Tanaka 40 CC 2 stroke. Both engines are bullet proof. You will tear a lot of cheap bikes up before you break these engines if you take care of them. The Tanaka 40 CC 2 stroke is noisier, faster, bigger and a pound or so heavier. The 4 stroke has a much more soothing sound but it takes a bit more pedeling at the low end.