Re: decarbing
+1 on Jerry's method although you can also use Sea Foam in place of Powertune directly sprayed into the carbs. Personally, I do this on my driveway with muffs and revving the engine using the control tower. Just make sure you put oil pan to cover the pavement for the carbon really sticks. For my winter preps, I spray seafoam into the cylinder to protect them and soak them until spring.