These things don;t like to sit there idling. A few minutes warming up is plenty. If you run at a lower RPM for extended periods of time it will foul it out too. When I'm working around the house, putting around, I try to open it up now and again. If not, I find myself pulling the plug and cleaning it after a while. When I'm trail riding I'm always heavy thumbed. That's my experience anyhow.
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