Posted by JRSutton on May 15, 2012 at 19:18:15 from (75.130.109.233):
Going to put the magneto on the 4H project super A tomorrow -
I'm not too experienced with magnetos.
I thought I knew what I was doing until I read the manual...
Tells me to put cylinder 1 at tdc - compression stroke. I'm good with that - makes sense. Figured I'd even go a hair past to make hand cranking safer.
Then turn the (not yet installed) magneto so it's ready to fire on plug 1.
Easy enough - mine has the little window - I can see when it's ready to fire on 1. Nice and easy. I tested it with a spark plug to be sure I had it right - sparks just like I expected with one click.
Next step is install the magneto - and retard it fully.
Ok - makes sense...
But then it tells me to crank the engine exactly one revolution back to TDC - which of course would be the exhaust stroke.
Then turn the mag towards advance until it clicks - and lock it in there. which would make a whole lot more sense to me to have done without cranking the engine that last full crank..
... ?
What am I missing here? Why crank the engine? wouldn't that make it spark on the exhuast stroke?
I assume the manual's correct and I'm missing something - but what?
Am I NOT supposed to have the mag ready to fire on one? perhaps it should have just fired on 1 when I install it???
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