We had a friend in our group who had a rather ugly old A65 Champ. It didn't have an impulse and was a bear to get started. I propped it a lot. Most times I could get two revolutions with one swing. We took the cylinders off one winter and our machinist friend rebuilt them and added an impulse. Next time I started it it had a nice snap when flipping it and started right up. Later that year I asked Ken the Champ owner how he liked all that power. He said except for starting better nothing changed, static and take off RPM were the same as was climb out.
Glenn
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