I flew with a 3100 until I had major valve guide problems. My own fault for 
not checking the rocker ratio with the vw jugs. I tore up the whole inside of 
the engine from metal in the oil. I had a stock engine sitting there so I just 
swapped it out and started flying. I saw virtually no difference in the 3100 / 
2700 on my set up. Static rpm was the same as was the cruise, so I just left 
it on and that was 85 hours ago
Steve

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