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As far as I know, it's factory. I work in the tree removal business and a customer gave it to me several months back. It hadn't been touched in years and I gave it a good maintenance. I don't know what to do about this.
float level, todays "oxy" fuel eats the rubber float valve in storeage and this will allow to much fuel to enter. I always run my bikes and quads on premix before storeage as the oil helps protect the rubber carb parts