Runs on two cyls evenly at tickover/starts fine
Yes clean carbs, use Berrymans B12 fuel additive in the gas, double dose run til hot, then put it away overnight. try next day. also change fuel filter if it's been standing all winter long.
you can try spray in carb cleaner too, remove aircleaner, raise slider in carb with finger or something and spray a bunch in there, let it sit overnight to get to work and try next day
also if fuel is old then get fresh
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check the plugs and wires, have you had your carbs cleaned or timed?
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