HRR688 question

I intend no finger-pointing or blaming anyone, or wanting to make a non-sensical mess about anything (the definition of Who Shot John).

I did say that idle timing is the same (12ºBTDC) in the new spark setup as it was in the earlier. That does not account for crank-speed timing (500rpm and below) which is area the HRR box is stated to change dwell numbers.

I can check crank speed timing easily enough. The point of my question is to, hopefully, find out what others have already sorted.

I intend it to be a simple question: If the HRR box changes crank-speed timing, how much is that change?