I picked up three used small Honda engines today, for free.<br /><br />One runs but burns oil. The other two are unknown.<br /><br />Two are GX340's, 11 HP OHV commercial engines.<br /><br />The other is (I think) a GX610, 18or20 HP V-Twin OHV commercial engine.<br /><br />I don't know how long they've been sitting.<br /><br />I want to see if these work, but before I do something to ruin them, I'm asking for guidance...<br /><br />What should I do prior to trying to start them?<br /><br />Thank you.