What you say does make a lot of sense now that I think it through. I could have just followed the directions and been fine - but I prefer to actually KNOW why I'm doing it that way.
The key was that it fires every half revolution -That's obvious when you do the 3rd grade math - 4 cylinder engine each firing once every 2 revolutions.
(But only obvious now that you pointed it out!)
So here's how I'm reading it:
Set mag ready to fire on 1 - put it in the block. Don't worry about exactly when it's going to click - just make it greatly retarded so you can be sure to make it click manually on the last step.
Rotating the engine one half revolution makes it fire on 1 (late) - and go to cyl. 3.
Another half revolution would fire late on 3, and get it ready for cyl. 4
1 and 4 are again at tdc, but now 4 is on its compression stroke.
Go slightly past tdc since you want the mag firing a little AFTER tdc to be safe - especially when hand cranking it.
Advance the mag by hand until it clicks, and tighten it down there. That's where it'll actually fire in relation to the piston in 4 - slightly after tdc.
And obviously if it's timed properly for one cylinder it's timed for all.
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