Sure.
The engine is bolted directly to a 3mm plate which is welded to the frame. This motor wouldn't fit in a standard frame so I designed the teardrop shape to fit it.

The reduction box is an ebay item from a pocket dirt bike, same mount as the GX. Gocart sprockets and chain down to the freewheel jackshaft.

The fuel tank wouldn't fit and is too small for any great distance so I use plastic camping fuel bottles as you can see mounted under the motor. These use the existing lines and filter but the tank must breathe so I drilled an extra hole in the cap I made. I get 100km to the liter at 50 km/h as a rough guide.

These are great engines, perfect for this application, much cleaner than the 2 strokes, about as efficient as you can get too. I have had the carby ice up in cold weather but you would get that with any small engine I guess. I can highly recommend the GX.