Did you check the throttle cable linkage to the carburetor? There is a retainer for the throttle cable near the carburetor. This will sometimes come loose and even though you move the throttle lever forward it may not be moving the throttle cable at the carburetor.
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If the engine will idle but dies at full throttle the main jet in the carburetor may be plugged. You can repair a plugged main jet by cleaning it, replacing the jet, or replacing the carburetor. If you choose to clean or replace the main jet, you will also want to clean the rest of the carburetor.
Your lawn mower turning over but not starting due to several reasons, such as a faulty or disconnected plug, a disconnected spark plug wire, a clogged air filter, or a contaminated fuel tank. A faulty carburetor, a dirty cutting deck, or a dysfunctional flywheel brake can also cause this.
You Lose Power in the Middle of Mowing:
Here`s why this happens and what you can do: Dirty Air Filter on Your Lawn Mower: Clean or replace. Dirty Spark Plug: Clean or replace. Build Up of Clippings & Debris: Clean underside of your lawn mower deck as noted above.
Disconnected, dirty or fouled spark plugs are common causes for engines that won`t start. For small engines, spark plugs typically need to be replaced every season or after 25 hours of use. You should also check to make sure the spark plug gap is set correctly.
Check the Air Filter: The most common reason why an engine bogs out under acceleration is because the air/fuel mixture is `dirty` or inefficient. If the air filter is clogged or has a lot of dirt in it, it could be bogging down the engine. Clean the air filter and see if the problem goes away.
To control engine speed, a mechanical governor uses gears and flyweights inside the crankcase to detect changes in the load and adjusts the throttle accordingly.
Clear the mower deck of debris
Grass clippings can clog the mower deck, especially while mowing a wet lawn, preventing the blade from turning. If the starter rope seems stuck or is difficult to pull, then it`s probably due to a clogged deck.
A clogged fuel filter is most commonly caused by leaving old fuel in the lawn mower. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the fuel filter and make the engine hard to start.
Changing the Spark Plug and Air Filter are good ideas, and are general maintenance items. The carb cleaner could also be sprayed into the carb through the intake. If those items dont restore power, there is a good chance your motor`s compression is low – and you need to rebuild it.
A dead battery is the most common reason why engines fail to start up. A common reason for batteries to fail is drain. Your car`s battery typically expends a small portion of its storage to start your car up, and then recharges from your alternator as you move.
By Rob Erlick. Engine RPM bog down occurs as the engine is loaded beyond its torque-producing capabilities. This occurs when engine RPMs are allowed to decay below the design specification. Bog down can occur during ground start, taxi, and the landing roll.
Common causes of why a car feels sluggish when accelerating include dirty mass air flow sensor (MAF), faulty spark plugs, defective throttle position sensor, clogged catalytic converter, faulty oxygen sensor, clogged air filter, and fuel system malfunctioning.
The throttle position sensor (also known as the TPS sensor or Throttle Valve Position sensor) is a part of the electronic throttle control system and is connected to the throttle body and monitors your vehicle`s throttle angle.
Within a motorsport engine – or the engine of any vehicle, there is a throttle valve. The throttle valve opens when the accelerator pedal is compressed. A throttle position sensor is used to measure how open the throttle valve is and therefore controls the amount of air which can flow into the engines intake manifold.
Fuel is introduced into the air stream through small holes (the main jets) at the narrowest part of the venturi, where the air is at its highest speed. Downstream of the venturi is a throttle (usually in the form of a butterfly valve) which is used to control the amount of air entering the carburetor.
(1) The blades should always be turned on at full throttle if the mower has a electric P.T.O. switch.