Winter Storage Checklist for Motorcycles: Battery, Fuel and Tires Before the Cold

To store a motorcycle for winter: fill the tank, add fuel stabilizer and run the engine 5 to 10 minutes, change the oil before storage, disconnect the battery and hook up a smart maintainer, overinflate the tires by 0.3 to 0.5 bar (about 4 to 7 psi) or put the bike on stands, lube the chain and cables, and cover it with a breathable cover, never plastic sheeting. L'Atelier estimates the job at about 2 hours. Here is the checklist in order, with the reasons and the numbers.

Store it or keep riding? Decide first

L'Atelier's decision guide boils it down to three questions. Do you need the bike every day? Then riding is a must, and the job is equipping yourself and the bike. Is your winter harsh, with salt, black ice and long freezing spells? Storage is the better choice. Do you have a garage and the gear? Winter riding demands good tires, warm clothes and regular washing, because road salt is corrosive. Many riders take a middle path: ride on dry, mild days, store through the salt and ice. In that case, keep the battery on a maintainer between rides and rinse the bike after every salted-road outing.

If you're storing, the stakes are simple. A bike put away carelessly greets you in spring with a dead battery, a clogged carburetor or fuel system, deformed tires and rust marks.

The checklist at a glance

Step 1: Fuel and oil (do these while the engine still runs)

Modern gasoline contains ethanol, which absorbs moisture and, according to L'Atelier's fuel storage guide, degrades in 1 to 3 months. On a parked bike, that means gum and varnish that clog carburetor jets or foul injectors, plus corrosion from condensation. The old empty-versus-full-tank debate is settled:

• Empty tank: no. Condensation forms on the bare walls and rusts the tank; fuel pump seals dry out.
• Full tank alone: better (less air, less condensation), but the fuel still degrades.
• Full tank plus stabilizer: the right answer. Little air, and the fuel stays stable for several months.

1. Fill the tank completely.
2. Add stabilizer at the dose on the product label. L'Atelier's E10 guide recommends a stabilizer that is compatible with ethanol: it slows oxidation and phase separation (water and ethanol settling at the bottom).
3. Run the engine 5 to 10 minutes. This is the crucial step: it carries treated fuel to the carburetor or injectors and through the whole circuit.
4. Carbureted bike: some riders also drain the float bowl through its drain screw after circulating the stabilizer, to avoid deposits. On fuel injection, this isn't necessary.
5. Change the oil and filter now, while the engine is warm. Used oil is acidic, and you don't want it sitting in the engine for months.

Step 2: The battery, winter's first casualty

A parked battery slowly discharges, and cold speeds it up. L'Atelier's winter battery guide puts it at about 1% of charge per day at 20°C (68°F), and faster below 5°C (41°F). Leave a bike 3 weeks or more without a maintainer and you're asking for trouble; store a discharged battery and plate sulfation can become irreversible within a few weeks.

1. Check the resting voltage (engine off, nothing switched on, multimeter on 20 V DC). For a lead/AGM battery: 12.6 V and above is good, 12.4 V is half discharged, 12.0 V and below is deeply discharged and needs charging right away. For LiFePO4: 13.0 V is full, 12.8 V is half.
2. Disconnect the negative (−) terminal first to avoid shorts and stop the alarm, clock and other parasitic loads from draining it.
3. Connect a smart charger (L'Atelier cites CTEK and Optimate types) and leave it on all winter. Smart chargers switch to maintenance (float) mode and won't overcharge.
4. No outlet where the bike sleeps? At minimum disconnect the negative terminal and recharge once a month for 4 to 6 hours with a standard charger, or store the battery somewhere warmer.
5. Clean the terminals: white deposits increase resistance. Wire brush, then dielectric grease.

Step 3: Tires and flat spots

A tire that sits loaded on the same spot all winter gets flat-spotted. L'Atelier's storage checklist says to overinflate by 0.3 to 0.5 bar and, ideally, put the bike on workshop stands so the tires carry no weight. In psi, that is roughly 4 to 7 psi (our conversion: 1 bar ≈ 14.5 psi, so 0.3 × 14.5 ≈ 4.4 and 0.5 × 14.5 ≈ 7.3). A center stand unloads at least one wheel. Also avoid direct contact with a cold concrete floor: a piece of cardboard or wood under each tire insulates it from the cold ground, a source of condensation.

Don't forget to bring the pressure back to spec in spring: measure cold, and use the values on your bike's label or owner's manual.

Step 4: Humidity, the cover and corrosion

This is the counter-intuitive one. L'Atelier's guide to protecting your bike from cold and damp explains that a bike covered carelessly can rust more than one left in the open: a waterproof plastic cover traps moisture, condensation forms underneath and sits on the metal. The material has to breathe.

• Plastic cover: short-term emergency only; avoid for long storage.
• Breathable indoor cover (soft fabric): for a garage, keeps dust off.
• Waterproof and breathable outdoor cover: essential if the bike winters outside; make sure it's well fitted and tied down, or the wind will rip it off.
• Wash and dry before covering: L'Atelier recommends a final wash before storage, and never covering an engine that is still hot or damp.
• Ventilated space: a garage that breathes beats a damp sealed box. In a small enclosed space, add humidity absorbers.
• Protect bare metal (exhaust, fasteners, clean fork tubes) with a protectant spray or wax, but keep it off brake discs and tires.
• Lube the chain, pivot points and cables before the cover goes on.

Spring: waking the bike up without breaking anything

L'Atelier's spring restart checklist covers the return. Before turning the key: check tire pressure (it drops during storage) and look for flat spots or cracks; check brake fluid level and condition, pad bite and rust on the rotors (old fluid should be bled out, since it absorbs moisture even when the bike isn't ridden); check battery voltage; look under the bike for oil or coolant leaks. If the fuel wasn't stabilized, watch for oxidized gas clogging the idle circuit. If you skipped the fall oil change, do it now. Then lube the chain and keep the first ride gentle: tires are cold and possibly slightly flat-spotted, and the brakes need to wake up.

Want this checklist adapted to your bike, for example whether your model is carbureted or which battery type it uses? Ask the L'Atelier motorcycle mechanics base a question like “My bike's dashboard looks dim and nothing happens when I press the start button, what's wrong?” and get an answer sourced from these guides.