Retrieved December 19, 2012. Similar to the prototypes and the very first fifty or so illustrations made, it had only one-cylinder motor with atmospheric intake valve; that is definitely, when the piston went down to the consumption stroke, the valve was sucked open up and when it began back again up, the valve was compressed shut. ^This resolve us
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Appear l'originale, period dotata di un motore bicilindrico boxer raffreddato ad aria, realizzata in pochissimo tempo su pressante richiesta dell'esercito americano, in quanto i militari erano rimasti impressionati dalla semplicità e affidabilità della motocicletta tedesca. In totale la Harley-Davidson produsse durante il secondo conflitto mondia