The engine seemed like it was going to be way too far back for me and would interfer with the brake and clutch linkages so I did away with the isolation and welded in a 1/4" plate and bolted the engine to it. Vibration is fine.
I still had to rework the clutch and brake stuff to work with the bigger 8hp engine.
Could you post a picture of how you hooked up the throttle cable. The Briggs I have the hookup is from the top or bottom, bottom the lever would be wrong and the frame is in the way, from the top the cable is really stiff and binds from the tight bends. Been trying to come up with another solution for a while now.
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