Winterizing Your Gas-Powered Lawn Mower

A well-maintained lawn mower starts effortlessly in the spring, runs cleaner, and helps make yard work just a little bit more enjoyable. Here is a basic overview of how to prepare your gas-powered lawn mower for winter storage. For the best results, make sure to follow the manufacturer's directions for the specific make and model of your lawn mower.


Drain or Stabilize the Fuel

Fuel doesn't stay fresh forever. If left standing for long periods, it turns stale, attracts condensation, and creates a gummy buildup on the inside of your carburetor. There are two schools of thought on what to do with leftover engine fuel during the winter. The first is to empty as much fuel from the gas tank as possible (using a siphon pump), and then run the mower until the rest of fuel is used. The second is to leave the fuel in the engine and add a stabilizer (to prevent deposits from forming), and then run the engine for 5 minutes to make sure the stabilizer reaches the carburetor. Both methods work, so it's really just a matter of what works best for you. If you store your mower in a dry, heated building or basement, you may want to empty the engine of fuel. If you store your mower in a cold shed or unheated garage, consider leaving the fuel in the gas tank, but adding a stabilizer.


Change the Oil

While the engine is warm, drain and replace the oil. Be sure to use the type of oil recommended for your lawnmower. Too much oil is as bad for an engine as too little, so make sure to fill the oil reservoir to the mark displayed on the dipstick. Dispose of used oil properly by dropping is off at a local recycling center or service station. If you own a two-cycle lawn mower, one that mixes the oil and gas together, you don't have to worry about this step.

Check Filters and Plugs

Remove the spark plugs to check for corrosion, and either clean them or replace them. Remove the air filter and knock off any loose dirt. If it's really dirty, you may want to replace it. Check, and if needed, tighten up any nuts, bolts, and screws that might have become loose during the mowing season.


Charge the Battery

If your lawn mower has a battery-powered starter, make sure it's fully charged before storing it for the winter. Mower engines do not fully recharge their batteries when operating, so in very cold climates, additional charging may be necessary during the winter in order to get a quick start-up in the spring.

Scrape the Mower Deck

After the final mow of the season, spray off your lawn mower with the garden hose and wipe it dry. Clean the underside of the mower deck thoroughly before storage. Use a metal putty knife to scrape off any caked on dirt and grass, and spray the area lightly with silicone spray to help prevent future build-up.

Sharpen or Replace the Blades

Check your mower blades and either replace them, or have them professionally sharpened. If you don't have one, pick up a spare blade to keep on hand, so you have something to use if your original blade becomes dull or damaged during the season.


Store in a Dry Environment

Store your mower in a dry environment. If your garage floor gets wet from snow and salt in the winter, consider parking your mower on top of a couple of 2 x 4's. Mower covers, if you use them, should be made from a breathable cloth material rather than plastic, which can trap water and cause corrosion. Stash a small box of mothballs near the engine to prevent rodents from nesting there.

About The Author: Ellen Brown is an environmental writer and photographer and the owner of Sustainable Media, an environmental media company that specializes in helping businesses and organizations promote eco-friendly products and services.


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November 17, 20140 found this helpful

I use to burn all the gas out of my lawn mower and snow thrower, but doing that a number of years it dried out the gaskets on my snow thrower carburetor it leaked bad. Had to replace with a new one. Now I only use that stabil and give it a double dose and tank completely filled and haven't had any trouble since. Took it out last week and after about three or four pulls it started right up and ran good.

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