I flew the plane with the new diaphragms in the Zama carb. It definitely improved the performance in that I can set the carb needles and the adjustments are steady throughout the flights. This is a big plus. I now leave the glow battery on until it warms up which takes about 2 minutes. Now I'm dealing with the mid range. It does seem to run too cold/rich in mid range. It could be the fuel. I run 2:1 gas to methanol and oil. Maybe I'll try the gas and glow fuel mixture or just gas with oil. I heard some people have had success with just gas/oil on the Poulan 25, it will definitely run hotter.