Why Does My Lawn Mover Not Start When Hot?
Summer days spent outside maintaining a lawn can quickly heat up the engine of any lawn mower. Unfortunately, heat can keep the lawn mower from starting. Here we explain some of the most common reasons why your lawn mower may not start when hot.
Spark Plug Fouling
One possible reason for your lawn mower not starting when hot is spark plug fouling. A fouled spark plug will cause a weak and unreliable spark. To fix this issue, you should clean the spark plug(s) and replace it with a fresh one if necessary.
Heat can also cause fuel to evaporate from the carburetor, resulting in the engine not getting enough fuel to start. To address this issue, you should:
- Drain the old fuel – If the fuel has been sitting in the carburetor for a while, it can evaporate, leaving your engine with nothing to burn. To prevent this, you should drain the fuel from the carburetor after each use.
- Check the fuel filter – The fuel filter may be clogged, preventing fuel from entering the engine. Make sure to check the fuel filter regularly and replace it if necessary.
- Use fuel stabilizer – Fuel stabilizers can help prevent evaporation of the fuel and help ensure your engine is getting enough fuel on hot days.
A dirty air filter will restrict the airflow to the engine, causing it to run hot. If the engine overheats, it will cause the lawn mower to not start. To fix this, you should clean or replace the air filter if necessary.
If your lawn mower doesn’t start when hot, it’s likely due to spark plug fouling, fuel issues, or a dirty air filter. Taking care of these issues will help ensure your lawn mower is running smoothly and reliably.
Why does my lawn mower not start when it is hot outside?
The primary reason your lawn mower may not start when it is hot outside is because the hotter temperature raises the engine’s compression. This increased compression makes it more difficult for the spark plug to ignite the fuel, thus preventing the engine from starting properly. To combat this, make sure your spark plug is in good condition and replace it if necessary. Drain sediment from the fuel tank regularly, ensure the battery is fully charged, and fill the engine with fresh fuel.
Additionally, check any fuel-cut-off switches, or the choke if your mower has one, to make sure the engine is getting enough fuel to start. Lastly, be sure to clean or replace the air filter to ensure optimal engine performance.
Taking care of these details will ensure your lawn mower is starting and running smoothly in hot weather.
“Why does my lawn mower seem to start fine when it’s cold outside but not when it’s hot?”
This is likely due to the heat of the engine that builds up when the lawn mower is running. This heat can cause the carburetor components to expand, affecting the fuel/air mixture and causing the mower to stall or refuse to start. To counteract this, make sure the mower is properly serviced and that the carburetor is adjusted appropriately for the conditions outside. Additionally, try to start the mower in a cool, shaded area, or allow it to rest for several minutes before restarting it.