For the first time in the life of the plane I am considering throwing in the towel on the rotary engine concept, or at least my ability to manage it.... Hey Dave; When I was building my plane, my buddy that helped with the test flying questioned my use of the rotary but by the time we finished the test flying he came to admire it (he really liked that it kept running even after we severely detonated it until after we got back on the ground), but a few years ago he chose to buy a flying BD4 with an O-360. He flew it once, before having to have the engine rebuilt. And FI update. For $45K. And now 2 years later he's still only a couple of weeks away from flying again..... So don't give up, thinking the alternative will always be easy.
But as for your current problem. Ever hear of a dye kit? I've got one and only used it once but it was worth it. Add a pack of fluorescence dye powder to coolant. Run engine. Use black light type of flashlight and look for traces of bright dye. All included in kit.
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