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I've thought of that before, except with 2 briggs and strattons. The engines would need to be syncronized somehow.. Or else you'll get a different result on every run. If they run together you get a lot of power, and the they run against you'll get a lot of speed. From what it sounds, you already have a lot of power, so you would need to set it up for speed..
One thought I had with the 2 briggs is to get 4 small sprockets and a minibike. Set the timing how you want it with the heads off and mark the spots. Put the sprockets on with the chain, and the engines will be direct drive now, much like a crank / cam in an automobile. This way they stay in sync.
Next would be to put another sprocket on the engine nearest to the wheel and have that driving a jackshaft. On the other end of the jackshaft it would have a centrifugal clutch operating the wheel. I think it would work, but I haven't had the funds to try it. I'm full of ideas like this, but never had the money to invest in them.
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