Manifold kit from FLYGAS is out there for sometime now for about $1200.
I did about same thing for $200 with very good results.
After removing intake manifolds I noticed that they are pretty rough on inside. That was original post with question = if there is benefit of polishing them and port match.
- in 4-stroke engine with 4 cylinders only way to have continuous flow = is 4 - to - 1 situation with 1 carburetor feeding 4 ways. Because in any position there will be always one piston is in suction mode.
In Rotax 912 with 2 carbs we have flow inside of this 2 carbs in constantly "stop and go" mode. Creating giant tsunami back and forth waves inside of intake manifolds. Effect of this "stop and go" we feel only at low RPM as vibration. Makes it worse with unbalanced carburetors.
Large diameter balancing tube is creating one large common supply plenum effect = were is more room for this waves to go. As a result at low rpm 1600-1700 feels almost like sitting in small car.
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