Based on recent evidence, I am not convinced of this. Needs more/better photos of the same ADU head taken at the same time both from the front and the rear showing the position of the cam timing marks and the cam sprocket with the G40 Hall sender shutter (without moving anything).
AFAIK, the cam timing marks O-O are used to sync the cams, not necessarily at TDC. Once the chain is on and they are sync'd together, it doesn't matter too much whether that wasn't the crank-to-cam timing position.
AFAIK, the cam timing marks O-O are used to sync the cams, not necessarily at TDC. Once the chain is on and they are sync'd together, it doesn't matter too much whether that wasn't the crank-to-cam timing position.

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