Assuming you are referring to a small 2 cycle engine, such as those found on lawnmowers, snow blowers, etc:
The most important thing to do when winterizing a 2 cycle engine is to add fresh fuel. Fuel that has been sitting in the tank for more than 30 days can cause problems, so it’s best to start with fresh gas. You should also add a fuel stabilizer to help keep the fuel fresh and prevent any moisture from building up inside the tank.
Next, change the oil. Dirty oil can damage an engine, so it’s important to start with fresh oil before storing the engine for the winter. Be sure to check your owner’s manual for the correct type of oil and amount to use.
Once you’ve added fresh fuel and oil, it’s time to run the engine for a few minutes. This will help distribute the new fluids throughout the system and prevent any condensation from building up inside the engine. After running the engine, let it cool down completely before moving on.
The next step is to remove any debris or build-up from around the spark plug. A clean spark plug will help ensure reliable starting when you go to use the engine again in springtime. Use a wire brush or similar tool to clean off any carbon deposits or debris around the spark plug hole.
With the spark plug area clean, you can now remove the spark plug itself. This isn’t strictly necessary, but it can help prevent corrosion while stored over winter. If you do decide to remove it, be sure not to lose track of which way it goes back in! Most plugs have a left-hand thread, meaning you turn them clockwise (or “righty tighty”) when installing them back into place. Refer to your owner’s manual if you’re unsure which way yours goes in – better safe than sorry! Once removed, give the spark plug hole a quick blast of compressed air just like you did with cleaning out any debris earlier on..this helps prevent anything from working its way back into this crucial area while stored away over winter months If you choose not leave out your plugs , simply put some anti seize lube on them before putting them safely away . Now would also be good time check your air filter too making sure its nice and clean ready for next season -replace if needed .