While draining is probably a good idea, it is less of an issue on gasoline issues than for R/C cars. The reason to run out an R/C car is that the fuel is alcholol and consequently it attracks moisture, causing rusty bearings. Gas does not attrack moisture and we live in a dry area, but the gas can get stale and gummy so make sure to put some “Sta-Bil” or other fuel stabilier in the gas before the last run of the engine. However since 2 strokes rely on the oil mixed in the fuel for lubrication, running the engine completely dry with continued cranking can score the cylinder. Consider pulling the plug, putting some oil in the cylinder and then having it crank a few times to disburse the oil. (then seal it up)