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Thanks for the suggestion, I just ordered a gauge, should be here Friday. My understanding is there is a Schrader valve to attach it to, I'll take the cowling off and watch it out on the water
Serial 1C563963, runs perfectly for ~5 minutes at full throttle, then RPM oscillates very rhythmically about 2 cycles/sec, no warning horn, immediately clears if throttle is pulled back and reapplied, but returns. I've tried a completely different fuel tank, bulb, and bypassed the fuel/water...
