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Lawn-mower-winter-storage-the-actual-steps-that-prevent-spring-repairs
Lawn-mower-winter-storage-the-actual-steps-that-prevent-spring-repairs
Every spring I used to call my neighbor for help starting my mower because it wouldn't turn over. Every year the answer was the same: gummed carburetor from old fuel sitting in it all winter. The fix took a carburetor cleaning kit and about forty minutes, but I repeated this problem for three years before finally doing the actual fall storage routine that prevents it. Since then the mower has started on the first or second pull every spring without exception.
The fuel problem: the most common source of spring failures
Modern gasoline contains ethanol, which attracts moisture and degrades over about thirty days of storage. Fuel that sits in a mower carburetor all winter gums into a varnish-like residue that clogs the tiny jets and passages. The result is a mower that either won't start or runs rough and surges. The fix is one of two things. Option one: run the mower until it's completely out of fuel before storage. Turn on the gas shutoff valve (if your mower has one), run the engine until it stalls, and restart until it won't fire anymore. No fuel in the carburetor means nothing to gum up. Option two: add fuel stabilizer to the remaining fuel, run the engine for five to ten minutes to circulate the treated fuel through the carburetor, and then store with the fuel in. Stabilizer prevents the ethanol degradation process and keeps the fuel usable for six to twelve months. This is the right approach if you want to store fuel in the tank and have it fresh for spring. Both options work. Running it dry is simpler. Stabilizer is better if you want to skip the "running until empty" process.Oil change, air filter, spark plug
Run the engine briefly to warm the oil, then drain it completely and replace with fresh oil of the manufacturer's specified grade. Old oil contains combustion acids that attack the engine when it sits idle. Fresh oil is more protective. Check the air filter. A paper filter that's grey or visibly clogged should be replaced — they're cheap. A foam pre-filter element can be washed with warm soapy water, dried completely, and re-oiled lightly before reinstalling. Inspect the spark plug. A plug with heavy black carbon buildup or a worn or corroded electrode gap should be replaced. Plugs are inexpensive and a fresh plug is one of the easiest contributions to reliable starting. If you're keeping the existing plug, clean the electrode and check the gap with a spark plug gap gauge — most small engine plugs run .030 inch.Blades and undercarriage
Scrape the undercarriage clear of dried grass clippings. Accumulated clippings hold moisture against the deck metal and accelerate rust. Hose or scrape clean, let dry, and spray exposed metal surfaces with a thin coat of protective spray. Inspect the blade while you have access. A blade with significant nicks along the cutting edge, or one that's bent, tears grass rather than cutting cleanly — torn grass ends turn brown and the lawn looks ragged all season. lawn mower blade sharpening with a file or bench grinder restores a clean cutting edge. Doing this in fall means the spring first mow cuts cleanly rather than requiring a separate sharpening before use.Battery care for electric and battery mowers
Lithium battery packs for battery-powered mowers should be stored at partial charge — about 40 to 60 percent — in a cool, dry indoor location. Storing a lithium battery fully charged accelerates degradation; storing it completely discharged risks deep-discharge damage that permanently reduces capacity. Bring the battery to roughly half charge before storing. For electric start gas mowers with a battery, either remove the battery and store it indoors or use a battery tender trickle charger to maintain it over winter.Where to store and how to cover
A garage or shed is ideal — covered, out of freeze-thaw cycles, and away from direct moisture. If you're storing outdoors, a fitted equipment cover that breathes (not solid plastic that traps condensation) is better than nothing. Clean and dry before covering.What I'd skip
Skip putting the mower away dirty and telling yourself you'll deal with it in spring. The cleaning, sharpening, and fuel prep takes about ninety minutes in fall. The carburetor cleaning or service call that results from skipping it takes longer, costs more, and happens when you actually need the mower. The bottom line: ninety minutes of fall storage prep is the entire difference between a mower that starts reliably every spring and one that requires service every year. It's genuinely that simple. Ready to shop? Compare Home & Garden across stores → 📚 Or browse home & garden guides in Digital Goods →📢 Affiliate Disclosure: This article contains affiliate links. We may earn a small commission at no extra cost to you when you click through and purchase.
