Garden
I have an old snapper lawn mower with a 3.5 HP Briggs & Stratton engine. The mower stalls when engine is hot.
Experienced gardeners share their insights in answering this question :
First thing is to check that plug is not fowling up when hot due to motor burning to much oil.
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Other things that could cause this issue are bad fuel, weak/colapsed/kinked fuel line, faulty spark plug, faulty ignition/coil, oil over full, clogged air filter, plugged/dirty carburetor, worn engine parts internal rings/valves/etc.
The most common reason for a surging lawn mower engine is a blockage in the fuel supply, but there are other possibilities: Bad gas. Bad spark plug. Dirty/faulty carburetor.
A Dirty Carburetor Can Cause a Lawnmower To Start Then Die
By far, the most common issue that causes a stalled motor is a dirty carburetor. The carburetor on your engine is the thing that draws in air and mixes it with the fuel. Contrary to what the movies might make you think, gasoline itself is not very flammable.
Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn`t work, you might need a new fuel filter.
Your lawn mower runs for 30 minutes then dies if you are having issues such as a bad spark plug, air problems, a malfunctioning carburetor, or a faulty gas cap. You may even encounter the issue that your lawn mower runs for 5 minutes then dies.
The problem may involve an annoying change (up/down) of engine speed while cruising at a steady pace, a low drop (or even cut-out) at idle or when approaching a stop, a wild high engine speed of several thousand rpm followed by a drop to near zero, etc.
Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Cleaning/overhauling the carburettor, adjustment of the governor, and/or changing the air filer may be required.
As the fuel level drops, a vacuum begins to form in the fuel tank because air can get in to fill the space the consumed fuel occupied. After about 10 or 15 minutes, the vacuum will become strong enough that fuel will stop flowing to the carburetor and the lawnmower will die.
Select first gear. Gently put pressure on the accelerator until revs reach around 1500. Slowly lift pressure from the clutch pedal until you find the biting point. When you are ready to release the handbrake, continue slowly lifting the clutch pedal and putting pressure on the accelerator.
One of the main causes of a lawn mower engine overheating is a dirty engine. Dirt and debris may get into the vents, blocking the air intake. This means the cool air cannot get to the engine to cool it. The solution: Remove the mower casing and clean the dirt and debris caught inside.
If your lawn mower starts, runs for a while, then dies, check the ignition coil, gas cap, and spark plug. One or more of these parts could be causing your problem. Follow our repair and symptom guide to help you fix this.
Discover Relevant Questions and Answers for Your Specific Issue
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Lawn mower cranck but wont start…
ANSWER : Since you already checked for spark and air I would drain all the fuel out of it and check that fuel for water. Over time some lawn mowers end up with contaminated fuel. You can see the water sitting on the bottom of the fuel if you let it stand for a bit in a small plastic bowl.
Be sure to empty and dry out you fuel can as well. Especially if the mower stopped running right after a refuel. Which is a good sign your gas can is contaminated too.
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Bosch electric lawn mower wont start, how do I fix it?
ANSWER : Cable damaged …renew cable . ..if does not work try condenser.
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How do i add transmission oil – Ariens Lawn Tractor 46"" Riding Lawn Mower 936053"
ANSWER : Should a plug or cap on top of transaxle.
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I have trouble starting a toro walk behind mower
ANSWER : All, I thought my carb was shot, so I replaced it. Still, start but no run (and had to use starting fluid). THEN!!! I noticed the spring to the “rev limiter” (just below and towards rear of carb) was not “tight”. The stupid bracket that holds the end of that spring had been bent down ~1/16″ and that caused all this heartache. CHECK YOUR REV LIMITER!!!
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Lawn mower motor runs good, the drive wheels run good but the blade won’t stay enguaged. Thanks
ANSWER : Check your cable that controls the blade engagement.
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Wont start no ignition put new plug in and fuel filter
ANSWER : Flush gas tank, fill with fresh gas and Stabil. Replace air filter. Remove bowl from carb clean bowl and holes in bowl screw.
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Lawn Mower Won’t Run
ANSWER : Ya didn’t give much info but it sounds like the carb had plenty of time to varnish up. take the carb off and clean it make sure you take the fuel bowl off and clean the floate and floate needle good. an auto parts store will have what you need to do everything with
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Lawn mower will start and run for 5 seconds and shut down
ANSWER : Will it stay running with your choke on? if so then clean your carb. if not then look for a blockage from tank to carb. ie fuel shut off, deteriorated fuel line. plugged filter etc
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