Matt, I don't have a clue on the plug reading. I can read plugs in a race car, shut the power off while wide open and coast to the pits and check the color of the plug but I'm not for sure about a 4 wheeler.
I've looked for restrictions to the breather or in the breather, havn't found any.
I also smell a little gas when I shut it off but I can't find a leak.
I need to get me a manual so I can figure out how to adjust the valves.