Ran the engine again yesterday and it had a bad miss till it got over 4500RPM. I re-did the tappets, valves for you septics, cleaned the oil from plugs, they are new.
Tried tuning it out without success then about 8pm I checked the voltage on the 2S LiION ignition battery, 5.6V, it had about 6 hours of use on that charge. I suspect that is the problem.
Will be checking the timing later today to ensure it is set at 30 degrees. If not I will fit the MMM timing hub and adjust to 30.