Airwaves is pretty much on the money. One step further: Ethanol gas left in the tank over the winter is DEVASTATING to your Carburetor. It may likely need Carburetor overhaul to remove SLUDGE. High speed operation may seem fine...Low speed (idle) is where the problem will manifest itself.
Fuel Injection seems to be much less susceptible to Ethanol problems because it injects fuel at High Pressure.
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