Run it first. Then decide if the carb needs anything.

Run it before you touch the idle mixture. After long storage, the carburetor’s problem is usually stale fuel, clogged idle jets, or a dried-out gasket—not seasonal temperature.

The idle mixture screw only affects the idle circuit, and it’s really meant to compensate for engine wear, vacuum leaks, or altitude—not whether it’s 40°F or 70°F outside. If the engine ran well when you parked it, the same setting will get you close enough now.

So fire it up, let it warm up fully, and see how it idles. If it stalls or hunts, you might have a clogged pilot jet, not a mixture problem. Clean the carb before you start turning screws. If it idles fine, leave it alone.

Adjusting the idle mixture “for the season” is a real thing on sensitive race carbs, but for a daily rider, mower, or small engine, it’s overkill. Future you doesn’t want to be that guy chasing a screw that was never the problem.