After it sat overnight and you put new plugs in it, did you choke it when you were kicking it over. Mine, it seems like after riding and then it sitting 30 min or so will need half choked to get it to start. As for the gas in the bed of your truck, it's probably dirt in the carbs, not letting the float needle shut off your gas all the way. When you park it, shut off the petcock. I don't like finding out the next morning that has happened and you've wasted however much gas/oil mix on the shop floor.