What Causes a Lawn Mower Engine to Rev Up and Down
A fluctuating lawn mower engine RPM can be an indication of an underlying problem. Several factors can contribute to this issue:
- Carburetor Malfunction: A clogged carburetor or jets can cause erratic fuel flow, resulting in fluctuations in RPM.
- Air Leaks: Leaks in the air intake system can disrupt the proper air-fuel mixture, causing the engine to hunt.
- Governor Failure: The governor is responsible for regulating RPM based on load. A faulty governor can lead to uncontrolled RPM variations.
- Electrical Faults: Ignition system issues, such as faulty spark plugs or wires, can disrupt combustion and cause RPM fluctuations.
- Clogged Fuel Filter: A clogged fuel filter can restrict fuel flow, causing the engine to starve for fuel and experience RPM surges.
Related Questions:
What are the symptoms of a lawn mower carburetor malfunction?
Difficulty starting, hesitation during acceleration, and black smoke from the exhaust.
How can I check for air leaks in my lawn mower's intake system?
Spray soapy water around the carburetor and intake manifold and look for bubbles.
What is the role of the governor in a lawn mower engine?
To maintain a consistent RPM under varying load conditions.
Can faulty spark plugs cause lawn mower engine RPM fluctuations?
Yes, worn or fouled spark plugs can disrupt combustion and lead to erratic RPM.
How often should I replace my lawn mower's fuel filter?
Depending on usage and fuel quality, every 50-100 hours of operation.
Related Hot-Selling Products:
- Briggs & Stratton Carburetor
- Echo Air Filter
- Stihl Ignition Coil
- Husqvarna Fuel Filter
- Toro Lawn Mower Spark Plug
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