Pinging on acceleration.

Looking at the pic in post #17, to me, it seems:
- the yellow arrow is pointing at the 35* mark. Spacing between the white marks look to be correct on that diam dampener for about 10* increments between marks.
- the 0* [ TDC ] mark is the lowest mark in the pic. You can see the distinctive slot in the pulley edge that extends to the rear edge of the pulley.