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do you know where the timing is or what the seting is it idle fine i just got it so i dont know what the maint was i was thinksit had something to do with the gas or sparkUse a timing light to see if it ignition breaking up or something else.---------------------Do you run fuel out of carburetor when done or do you leave carburetors full of fuel.---------------Fuel today tends to plug up tiny jets and cleaning of carburetors must be done.