Erratic Timing

ScamperTom said

So to get the timing to advance earlier, should I ditch the big spring? I don’t really know what it’s doing past 4k...

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That long looper does nothing to probably well past 3000. If you map out your timing on a graph at every 400 rpm intervals you will see exactly when it starts/quits, and how much it contribute which is seldom more than 4*. Fast curves are not always the answer. Getting your your WOT power-timing sorted is job #1 . Then you do whatever you can for other conditions.

1 degree on the lite means nothing, less than nothing to the engine, unless it is the one degree the initiates detonation. But that is easy to resolve,lol.