A quick way to start an ATV after sitting is to check fuel quality and the fuel valve, ensure the battery is charged, verify the oil level and air filter, and then follow a safe starting procedure. This article explains each step in detail, including safety checks, a step-by-step starting method, troubleshooting tips, and preventive maintenance to avoid future issues.
Pre-start safety and condition checks
Use this checklist to ensure the ATV is ready to start and safe to operate.
- Fuel quality and valve: Fill with fresh gasoline if the fuel is old or degraded, and confirm the fuel valve (on/off/reserve) is in the correct position. On carbureted models, stale fuel can flood the carburetor; on fuel-injected models, stale fuel can still cause hard starts.
- Battery condition: Ensure the battery is charged and the terminals are clean and tight. If the battery is weak, connect a charger or a tender designed for your ATV’s battery type.
- Oil level and condition: Check the engine oil to the recommended level and quality. Low or dirty oil can cause poor lubrication and hard starting.
- Air filter: Inspect for dirt, dust, or moisture. A clogged air filter can choke starting and running; clean or replace as needed.
- Spark plug: Inspect for fouling, cracks, or excessive wear; replace or gap as required for reliable ignition.
- Fuel lines and carb/EFI: Look for cracks, leaks, or signs of deterioration in fuel lines. For carbureted engines, consider a quick carburetor inspection or cleaning if fuel hasn’t been changed in a long time. EFI systems may require different procedures, but leaks or dissolved seals should be addressed.
- Cooling system (for liquid-cooled models): Check coolant level and look for leaks or signs of overheating.
- Kill switch and ignition: Ensure the kill switch is in the run position and the ignition switch is on. Verify the transmission is in neutral (or gear is safely secured) before starting.
- Brakes and safety gear: Ensure the parking brake is off or disengaged and that you’re wearing appropriate safety gear before attempting to start and test ride.
Completing these checks helps prevent flooding, leaks, or damage when you finally fire up the engine.
Step-by-step starting procedure
Follow these steps to start an ATV that has been sitting, taking into account common differences between carbureted and fuel-injected models.
- Mount the ATV, apply the brakes if required, and verify the transmission is in neutral (or park for automatic transmissions) before starting.
- For carbureted engines: set the choke to the appropriate cold-start position (often half to full), and ensure the throttle is closed. For fuel-injected engines: there is usually no choke; ensure the throttle is in a closed position to avoid flooding.
- Turn the ignition on and engage the starter. If your ATV has a kick-start option, you can use it if the electric starter fails, following the manual’s guidance.
- Crank for short bursts (about 5–10 seconds). If the engine does not start, wait 10–15 seconds to protect the starter motor and allow fresh fuel to reach the cylinders, then try again.
- Once the engine fires, gradually release the choke (if used) and allow the engine to idle. If running is smooth, you can gradually increase RPMs to warm up the engine, especially in cooler weather.
- Listen for unusual sounds, smoke, or a strong fuel smell. If you notice any of these, stop and diagnose before riding.
- After it starts, let the engine warm up briefly and perform a smooth idle check. Check for leaks or abnormal exhaust behavior as you prepare to ride slowly.
Carbureted models often require a light choke during cold starts and may need slight throttle adjustments as they warm up. EFI models rely on electronic control and typically don’t require choke; they may still benefit from a gentle warm-up and careful throttle control.
Carbureted vs. fuel-injected models
Carbureted ATVs generally benefit from a light choke during a cold start and a brief idle while the fuel system primes. Fuel-injected (EFI) ATVs usually start with no choke; if starting is sluggish, checking fuel quality and the electrical system becomes more important. Always consult your owner’s manual for model-specific starting nuances.
Troubleshooting common issues after sitting
These are typical problems and what they usually indicate, plus practical steps to take before contacting a mechanic.
- No start or weak crank: Check battery charge, battery connections, and ensure the ignition is on. If the starter motor cranks slowly, the battery may be undersized or failing.
- Heavy fog or strong fuel smell: Possible flooded carburetor or excessive fuel in the cylinders. Try a few longer cranks with the choke off (if applicable) and allow the engine to vent before trying again.
- Rough idle or misfiring: Spark plug condition or dirty air/fuel passages; inspect the spark plug, clean or replace filters, and consider a basic carburetor or fuel injector cleaning if permitted by your model.
- Smoke from exhaust: Light white smoke can indicate cold combustion; thick blue or black smoke may signal oil or fuel issues and should be checked by a technician.
- Leaks or overheating: Inspect fuel lines, coolant hoses, and seals for signs of wear or leaks. If overheating occurs, stop and allow the engine to cool, then diagnose cooling or lubrication problems.
Addressing these issues promptly helps prevent frustration and potential damage during future starts. If problems persist after basic checks, consult a qualified technician with the ATV’s model information.
Maintenance to prevent future starting problems
Proactive care keeps an ATV ready to go when you need it. The following practices can help avoid the most common post-storage starting issues.
- Use fresh gasoline and stabilizers when storing for extended periods. Run the engine periodically to circulate fuel and prevent varnish buildup in the carburetor or injectors.
- Keep the battery on a trickle charger or tender during storage, and test charge before use after long sits.
- Replace the air filter and spark plug at manufacturer-recommended intervals or sooner if you notice signs of wear or fouling.
- Inspect fuel lines, clamps, and seals for cracks or leaks. Replace any worn hoses to prevent leaks and the risk of fire.
- Flush or treat fuel systems as needed if the vehicle has sat for months. For carbureted models, consider a carburetor cleaning if trouble-start issues persist.
- Follow seasonal storage guidelines: drain water from the cooling system if applicable, protect the battery from extreme temperatures, and store in a dry, ventilated location.
Regular preventative maintenance is your best defense against stalled starts and unexpected downtime. Keeping up with simple checks can save time and extend the ATV’s life.
Summary
Starting an ATV after it has been sitting requires a careful sequence: verify safety and condition, perform a thorough pre-start check, follow a disciplined starting procedure tailored to carbureted or fuel-injected engines, and address any symptoms promptly. Regular maintenance and proper storage dramatically reduce the chances of hard starts in the future. With these steps, riders can return to the trail with confidence and fewer surprises.
How to start an engine after sitting for a long time?
How to Start the Engine After Idling
- Use a high-capacity battery. Before starting the engine, you need to turn on the high beam headlights for 5 seconds.
- Press the clutch before starting the engine.
- Turn a starter in no more than 10 seconds.
- Before turning the key, pump fuel with the gas pedal.
How to help an ATV start in the cold?
Cold Weather Starting Tips for Your ATV
- Ensure the battery is fully charged. Use a portable charger if necessary.
- Inspect the battery terminals for corrosion and clean them with a terminal brush.
- Test the battery voltage with a multimeter. A reading below 12.4 volts indicates the battery needs a charge or replacement.
How long can gas sit in an ATV?
The best advice is, yes, you could probably go a month, but don't go past that. You want to make sure, if it's at all possible or available, to use non-ethanol fuel, because that stuff phase separates and all the junk heads down to the bottom.
How to start a 4 wheeler after sitting?
To start an ATV needs three things:
- Put gas in the tank.
- Charge the battery.
- Turn the run switch to the “on” position.
- Turn on key.
- Actuate choke.
- Squeeze the left or right brake lever.
- Press the starter button, usually located on the right-hand side easily accessible using your thumb.