Have two H's, both workers, both converted to 12 volt w/ one wire alternators. (smaller Hitachi's) Both on Magnetos. One is standard bore, new pistons and sleeves and is in top shape. The other has firecrater pistons and is also in top shape, averaging 145lbs per cylinder. Both start great, and have had NO problems with batteries or magnetos plus I have much brighter lighting now.
On the magnetos "turning too fast" with a 12v starter, it was explained to me that the impulse performs two functions. 1st, and foremost as far as safety is concerned, it retards the spark to avoid engine kickback at low (handcranking) speeds. 2nd, it spins the armature over more quickly to ensure a "hot" spark at low cranking speeds.
Once the engine has reached an rpm over 200-250, the magneto is producing adequate spark w/o the impulse's assistance, so the impulse is disengaged by the centrifugal effect of the pawl design.
That being the case, IMHO, if the starter is spinning the engine over fast enough to disengage the pawls, there is no issue, as its making enough spark and there is enough flywheel inertia to carry the pistons over tdc and not "kickback" . If it is not spinning it fast enough to disengage the pawls, (so you're hearing the click click click of the impulse tripping) and it still isn't starting, you have other issues to address. If it starts quickly, and the impulse only clicks a couple of times, I doubt much more wear will occur than starting it on a 6v system that trips it several times before starting.
again, just my opinion. No warrantees implied or expressed.
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