Why Won't My ATV Start After Sitting for Several Months?
After months in storage, an ATV may not start because the battery cannot supply cranking power, the fuel has deteriorated or fuel and ignition components need attention. Rodent damage, interlocks and corrosion are also possibilities. First distinguish an engine that will not crank from one that cranks normally but never fires; they need different diagnostic steps.
By Swedlund's Lawn & Power Sports ·
Begin with safe, model-specific starting checks
Park on level ground, select the specified gear or neutral position, set the parking brake and follow the manual's start sequence. Confirm the run switch and required brake or interlock position. Do not bypass those switches, bridge starter terminals or repeatedly crank an engine that will not turn. Work outdoors; exhaust can accumulate quickly in a garage. Stop if you find fuel leaks, chewed wiring or a battery that is swollen or leaking.
A working headlight does not prove battery health
Lights require less current than the starter. A battery can illuminate the dash yet collapse under cranking load, while loose or corroded terminals can imitate a bad battery. Use the charger specified for its chemistry; lithium and lead-acid batteries are not interchangeable charging jobs. A shop can load-test the battery and check starting-circuit voltage loss before replacing a starter. Follow the manual if jump-starting is permitted at all.
Carbureted and injected machines differ
On a carbureted ATV, deposits can restrict jets or affect the float valve after fuel sits. An injected machine may have a pump, injector or pressure problem instead. Do not assume an audible pump proves correct fuel pressure, or that every stored machine needs a carburetor. Record fuel age and whether it attempts to fire. Never spray starting fluid into an unfamiliar intake or open a pressurized fuel system as a casual test.
Inspect for damage before replacing parts
With the ignition off and the engine cool, inspect accessible wiring, plug boots, intake ducts and the airbox for damage or nesting material according to the manual. A wet or fouled plug does not, by itself, identify why combustion failed. Spark tests around spilled fuel create a fire risk. Compression, ignition and fuel-delivery testing may be needed if the engine turns normally but will not start after basic checks.
Prevent another storage no-start
Use the model's fuel-storage procedure, maintain the battery with an approved system, protect wiring from pests and record service before parking it. Swedlund's in Cologne can help separate a battery problem from fuel or mechanical faults without guessing from symptoms. Call 612-816-8013 with model details and ask about pickup and delivery availability. All equipment drop-offs and pickups are by appointment only. Please call ahead.
Related: Request ATV Repair · ATV maintenance intervals · Loss of power under load
ALL EQUIPMENT DROP-OFFS AND PICKUPS ARE BY APPOINTMENT ONLY. PLEASE CALL AHEAD.
Request ATV Repair · Ask about pickup and delivery availability.