base timing keeps advancing by itself...

Mail came, installed the new spring this afternoon. Bigger/more coils but felt about the same by my non-calibrated stretching. Put everything together, set base timing at 14 and confirmed total was 36 by about 3000 rpm. New curve seemed just a bit slower, still adding in about 6 degrees at the crank mech by 1000 rpm but still less than previous spring...

Let engine get hot, went for a drive and still got serious rattling around 2k-2500. So I said forget what the timing light says, im just going to dial it back to a good safe setting and work my way up slowly from there. Pulled it back to 8 initial, pulled hard, ran strong no rattles and idled well at 800N, 750ish in gear with no carb adjustments. Currently its 70 degrees out. I will drive it tomorrow, hot day and see if I can get any detonation. If not, I will bump up timing incrementally until I get detonation.

Its possible I am running a bad batch of gas as well that is exacerbating the detonation issue. At this point, I almost don't care what the timing light says it feels very strong even pulled back to 8 initial.

Will keep the group posted as I slowly advance timing to a final setting. If I get a baseline on the hottest day with the crappiest gas, I can pretty much operate with confidence from here on out.