I have been having issues with my new Power Arc system. Before I get into it though I want to make it clear I have been in contact with Fred and Power Arc, both have been extremely helpful and accommodating but we have run out of different things to try. So here I am. Anyways the story is I had a Power Arc system before and never had an issue until my voltage regulator failed and proceeded to fry the ignition, battery and half the bulbs on the bike. Very sad. So I sorted out the voltage issue replaced the battery, bulbs, and bought an updated Power Arc from Fred and did nothing else. I got everything installed and this thing would misfire at a specific RPM (guessing 4500ish) any gear, any load, any throttle position. The only thing that would make it better or worse was playing with the ignition curves. Fred sent me a whole new setup again and I changed the ignition module itself, the coil and extensively checked the plug wires. None of this made a difference so I did not get a defective module from Power Arc. Eventually Power Arc concluded it has to be with my carburetors being too lean. They ran fine with the older system but to try something new I raised the needles and enriched up the pilot circuits to the point it was almost smoking black. None of this seemed to make a difference. I have tried running the ignition purely off the battery as a total loss system with no difference. I have played with the encoder disk spacing, no difference. I have played with plug gap with no difference (wider and smaller than originally set). I have also played with ignition timing (by adjusting the encoder disk advanced or retarded from TDC) just a little bit and it changed the miss a little but did not fix it. So I am looking for more ideas so if anyone else has something to try I would love to hear it. Thanks for taking the time to read my essay.