I keep forgeting we are talking baout a 150, I remeber how small the exhaust outlet is in the mid section of the smaller motors. Had a freind that built a 200, could never get it to run like he thought it should, took the power head off and discovered he had a 135/150 mid, we replaced it with a 200 mid, it ran like it was supposed to tehn. I still thin k tht 17 Mirage pluss would be a good prop, it will probably pull the rpms down to at least 5400
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