How to Winterize Lawn Equipment and Power Sports for a Minnesota Winter
The single most common cause of spring no-start problems we see is equipment that was put away without proper fuel treatment or battery care. Five minutes in October saves hours of repair in April.
Fuel: Your Biggest Winter Enemy
Ethanol-blend fuel — the 10% ethanol gasoline sold at most Minnesota gas stations — begins to break down in as little as 30 days. After 60 to 90 days, it can varnish the tiny passages inside a carburetor and make it nearly impossible to start without a full carburetor clean. Your options: add a fuel stabilizer like Sta-Bil to the tank and run the engine for 5 minutes to distribute it, or drain the tank and carburetor completely and run the engine until it stalls.
Battery Storage
A lead-acid or AGM battery left in a cold garage over winter will self-discharge and may not recover. Remove the battery and store it indoors — a basement or heated garage works well. Attach a trickle charger or battery maintainer to keep it at full charge. A battery that winters properly will last several more years. One that freezes in a discharged state is usually permanently damaged.
Oil Change and Fogging
Old oil contains combustion acids that corrode engine internals over winter. Changing the oil before storage — not in spring — is the right approach. For ATVs, UTVs, and snowmobiles that will sit for months, consider fogging the cylinder with engine fogging oil through the spark plug hole or air intake. This leaves a protective film on the cylinder walls and prevents corrosion.
Tires, Belts, and Covers
Inflate tires to the recommended pressure before storage — cold air causes pressure loss and flat-spotting. Inspect belts for cracks and replace any that are borderline; rubber deteriorates faster in freezing temperatures. Use a breathable equipment cover to keep dust and rodents out while allowing moisture to escape.
Related: Preventive Maintenance · Snowblower Repair · ATV & UTV Repair · Schedule Fall Service