Not Athol or Dave, and they would likely have much better details, but I think I saw you posting this in Deere [yes, I've had to sneak around there just a bit lately :lol: ] and somehow didn't get around to a replying.
A lot of mags will fit an F20, so it's a bit hard to say what exactly, but it sounds like you have a manual advance yet, so let's rule out after market and say F-4.
I've always found it easiest to just put the audible click right at to slightly after TDC. Of course, still worth double checking that the points are just opening at TDC with the impulse off after you bolt it up [and minimum advance, though more if you want to try it a little late first].
Not sure about an F4, but when I had the timing light on an E4A on a 22-36 recently, I don't think I had over 15 degrees of travel (though a tempermental grounding point took up more than it should have). I think the impulse on that is an additional 17, but don't quote me there either!
This post was edited by spiffy1 at 07:23:34 08/06/09.
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