Back when Staton Inc was selling Honda GXH50 engines, this is how they connected a throttle cable to the stock carburetor. It becoming apparent the problem with these engines will be finding a ⅝" straight shaft clutch for them.
I had a lot of success installing stock 80cc 2-stroke carbs onto the 49cc 4-strokes.
In the beginning, I had to custom make each manifold... but eventually had a bunch of them made on CNC machines.