Mark, are you running the ignition system as diagrammed on your web site?, If so might I suggest you pull the distributor cap and look for signs of moisture condensing in it when you climb to cooler altitudes. You may see some carbon tracks on the inside of the cap. some of the lower quality caps are prone to hairline cracks which can cause an intermittent misfire. If this shows nothing then I would pull the cowl and after dark run the engine up and have a helper closely look for any arcing around the coils and the cap and wires. It sounds like a moisture caused misfire in the ignition circuit to me. Looking for such things in the dark makes them much easier to find. That fat blue spark really shows up. Hope it helps.
Randy Powell Wachapreague Va. randywpow...@verizon.net > My first flight after the rebuild was thirty minutes with a hiccup at > 4000' > in level flight approximately 15 minutes into the flight. The second > flight > was for 1.5 hours and had no problems. The flight yesterday was for 1/2 > hour > with three hiccups total. These hiccups are as if someont turned off the > ignition for a half second each time. >
