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Travis makes a couple of good points. Weak spark can cause your problem also. Another possibility is the alcohol content in fuel. It can be hard on fuel systems. And cause problems. Especially if it's at 10% or more. Some machines are more affected than others. Some areas use a higher content. So I'd get a spark tester, that's made to see how far the spark will jump. They're not expensive. But just seeing if it's a blue spark isn't enough. Test all plugs, and wires. Pay attention to which plug came from which cylinder. That information might be needed. Good, clean, normal plugs. Good hot spark. If you have both of these, then it almost has to be a fuel issue. Of course there's other possibilities. But given the low hours, and condition of that machine. Most of the other possibilities seem unlikely.