It sounds to me like there maybe two contributing factors;
1) Inadequate mixing of the fuel and air in the combustion chamber, causing lean and rich areas in the chamber. This might be helped by increasing the fuel line pressure by decreasing the injection valve lift by increasing the valve lash. There are many theories on the correct way to improving mixing in the combustion chamber such as shrouds on the valves or swirl inducing features in the gas port.
2) Incorrect fuel mixture in the precombustion chambers, have you attempted to vary the pressure of the fuel feed into the precombustion chambers?
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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