{"id":2112287,"date":"2023-06-15T21:21:00","date_gmt":"2023-06-16T04:21:00","guid":{"rendered":"https:\/\/www.sawinery.net\/?p=2112287"},"modified":"2023-09-15T02:37:12","modified_gmt":"2023-09-15T09:37:12","slug":"lawnmower-engine-surging-causes-how-to-fix","status":"publish","type":"post","link":"https:\/\/www.sawinery.net\/lawnmower-engine-surging\/","title":{"rendered":"Lawnmower Engine Surging \u2014 Causes & How to Fix"},"content":{"rendered":"
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Lawnmowers are very efficient in cutting large grass areas quickly. However, there\u2019s nothing more frustrating than when the engine surges and loses power mid-job.<\/p>

I\u2019ve gathered everything you need to know about lawnmower engine surging to help you tackle this issue with ease.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Why Does a Lawn Mower Surge?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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When the ratio of gasoline to air in an engine is off, a phenomenon known as surging occurs. The carburetor is the most likely point of the mower engine surging, with odd fuel-air mixtures running low or rich due to the problem.<\/span><\/p>

Also, inconsistent fuel supply can lead to uneven engine performance and surging. Additionally, a faulty spark plug or ignition system can cause irregular firing of the engine, resulting in surges.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Lawn Mower Surges: 8 Reasons and Solutions <\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Reason #1: Poor Gas Quality \n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A common reason why mowers surge is when owners use old or contaminated gas. The poor quality of the gasoline leads to erratic combustion, making the engine struggle to run smoothly.<\/p>

If you think your mower\u2019s gas might be contaminated, a visual check can help. Just compare the color and clarity of the gas in your lawn mower to some fresh gas. Differences can often indicate a problem.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Solution: Remove the Bad Gas <\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Step 1: Get a Gas Can\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Get a gas can and fill it with the bad fuel. Put it near the lawnmower\u2019s fuel tank so you can easily supply fuel with it.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 2: Place the Pump\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Take off the gas cap, then connect the pump\/siphon to the lawnmower\u2019s gas tank (inlet) and the gas can (outlet).<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 3: Start Pumping the Gas\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Proceed with the gasoline transfer by starting the pumping\/siphoning operation. It\u2019s important to be careful not to damage the siphon, as it\u2019s difficult to resume the process with so little fuel left.<\/span><\/p>

Interesting Read<\/b>: How to Drain Gas from a Lawn Mower Without Siphon<\/u><\/a>\u00a0<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 4: Refill the Gas Tank and Test the Mower \n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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After draining the old fuel, I always make sure to refill the tank with fresh gasoline. Then, check to determine if the surge is still present by using the mower. The process of flushing out the old gas from the mower\u2019s gas tank and introducing new fuel could take a few minutes.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Extra Tip\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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For Briggs & Stratton small engines, I suggest using gas with no less than an 87 Octane rating and no over 10% Ethanol.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Reason #2: Clogged Vent of a Fuel Cap \n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The gasoline filler cap on most lawnmowers has a small vent that keeps the fuel at the right pressure and vacuum. Lawn mower engine surging can come from the wrong back pressure, which could force fuel into or away from the carburetor.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Find the little hole on the cap that you use to fill the mower\u2019s gas tank. The dirt within is producing pressure problems, and the consequent swells.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Solution: Clean the Fuel Cap Vent\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Step 1: Detach the Cap and Clear the Clogs\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Take off the fuel tank\u2019s top and find the release valve. Remove the dust and debris blocking the vent hole with a needle or pin. The greatest tool for the job is a sewing needle.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 2: Put the Cap Back and Test the Mower \n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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After cleaning the vent, reattach it to the tank by twisting it back onto the mower.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Reason #3: Fuel Filter is Dirty\n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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When I inspect a mower, I always keep an eye on the gas filter. If it\u2019s clogged, the carburetor doesn\u2019t get the fuel it needs, leading to an engine surge.\u00a0<\/span><\/p>

A quick visual check usually do the trick. It\u2019s important to ensure the gasoline filter is free of debris that could clog it. Keep a brand-new replacement filter handy.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Solution: Replace the Fuel Filter\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Step 1: Detach the Ignition Cable\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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To avoid any potential catastrophes, disconnect the ignition cable and tuck it so it does not get in the way. There will be spillage, and you must keep the area free of sparks.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 2: Turn Off the Fuel<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Finally, turn off the fuel supply to the lawn mower.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 3: Detach the Spring Clips \n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Pull the line away from the dirty fuel filter and undo the two spring clips holding it in place with a pair of pliers. You can slide the clamps along the pipe to do this.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 4: Unlink the Fuel Line\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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You can detach the gasoline lines from the filter with the clamps out of the way. To remove the gasoline filter,\u00a0 twist it while pulling. A cut-off valve can prevent the engine oil from leaking from a tank, but you can simply choke the line if you don\u2019t have one.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 5: Link the New Filter\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Get a new gasoline filter and install it in the system. Since petrol can only move in one way, you\u2019ll want to ensure that your orientation is proper. I recommend a directional arrow on the side of the filter.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 6: Put Back the Spring Clips\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Use the pliers to replace the spring clips, and check if they are in their appropriate places and securely fastened. If you notice that they are loose, you should replace them.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 7: Turn On and Test the Mower\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Turn the gas on and give the mower a spin. Since the system is filled with air when the filter is changed, it may take many pulls to get the gas to the engine.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Reason #4: Faulty Spark Plug\n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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An unreliable spark is produced as a sparkplug deteriorates from soot buildup. When this happens, the dirty spark plug will not provide a steady spark but rather intermittent sparks that will cause short bursts of combustion or your mower will start then die<\/u><\/a>\u00a0<\/u>soon after.\u00a0<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Solution: Replace the Spark Plug\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Step 1: Take Out the Ignition Cable<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Disconnect the bad spark plug cable and push it out of the way first.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 2: Take Off the Spark Plug\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Then, use a spark plug wrench or socket to remove the existing plug.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 3: Install the Brand New Spark Plug\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Put the replacement spark plug in the engine head, then screw it on as tightly as possible with your fingers. The plug should be finger-tight before any additional torque is applied, but be cautious not to overtighten the spark plug in your engine.\u00a0<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 4: Fasten the Ignition Cable\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Reconnect the spark plug cable and test the mower. An instant uptick in quality is to be expected.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Reason #5: Carburetor Jet is Clogged\/Dirty\n<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The carburetor houses several tiny jets, some of the essential parts of a mower. In case of troubleshooting, you need to know where the carburetor is on your lawn mower<\/u><\/a>.\u00a0<\/span><\/p>

In this case, I usually notice that petrol is pushed through the jets under high pressure, turning it into a fine mist before mixing with air and heading to the chamber. So, if dirt and debris get into the gas, it can cause a blockage.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Solution: Unclog\/Clean the Carburetor Jet\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Step 1: Unfasten the Spark Plug\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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You should remove the spark plug before working on an engine. Take the ignition cable out of the cylinder and tuck it away.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 2: Switch Off the Fuel System\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The next step, if available, is to turn off the gasoline supply.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 3: Take Off the Air Filter Cover and the Filter\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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If your lawn mower has a removable air filter,\u00a0 the next step is to unscrew the cover\u2019s mounting bolts. Simply using a screwdriver ought to do the trick.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 4: Take Out the Backplate Mounting Bolt of the Air Filter\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The bolts attaching the air filter back plate to the mower must be removed using the socket wrench. When you take these off, the lawnmower will no longer be attached to the backplate or the carburetor.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 5: Detach the Breather Pipe from the Crank Case\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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You need to disconnect the breather line from the mower\u2019s crank to take out the air filter rear plate. Pry the pipe out from its spring clamp with a pair of pliers. When you unhook yourself from the pipe, you can slide down the pipe.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 6: Take Out the Gaskets\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A gasket separates the air filter and the carburetor housing. You can remove this and put it somewhere else.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 7: Unlink the Fuel Line\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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After you remove the air filter, you can connect to the carburetor line. It, too, will be attached with a spring clip that can be easily detached, just like the breathing pipe.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 8: Unlink the Spring and Throttle\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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When securing the carburetor to the mower, the governor spring and full throttle linkage are the last bits I deal with. These have to be removed from their carburetor mounts manually. Nothing more than some time and calmness is required.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 9: Clean the External Part of the Carburetor\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A can of WD-40 and a used toothbrush are my go-to tools. After removing the filth, use an old rag to clean the carburetor.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 10: Detach the Fuel Cap\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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You can loosen the bolt at the base of the cup with a socket wrench. Removing the bolt makes it possible to separate the cup from the carburetor.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 11: Pull Out the Float & Pin\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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As you can see, a single side of the float serves as a hinge. The float can be detached by first pulling the float pin out of the float with a pair of needle nose pliers and setting it aside.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 12: Unfasten the Jet\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Remove the jet from the carburetor next. You\u2019ll find a tiny screw easily removed with a screwdriver. The jet can be tipped out after this screw is removed.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 13: Clean the Carburetor Jet\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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To clean the jet, insert one of the tiny files from a carburetor cleaning wire set into the jet. You may need to use force and a can of carburetor cleaner to remove the grime from your carburetor and needle valves if it\u2019s particularly filthy.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 14: Clean the Internal Part of the Carburetor\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Spray the inside of the dirty carburetor thoroughly with the carb cleaner. Wait a minute for the cleaner to work, and then clean the carburetor bowl hold-down bolt.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 15: Put Back the Float, Jet, and Fuel Cap\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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To reassemble, you must do the opposite of what you did to get here. Putting in the cap comes after fitting the jet and screw.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 16: Install the Lawn Mower Carburetor\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Once you\u2019re finished, you can reattach the two gaskets, gas line, spring, and throttle linkage to the carburetors. To finish, remove the air filter backplate and reattach the vacuum hoses.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 17: Test the Mower\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Now that you\u2019ve finished cleaning and reassembling the lawnmower, you can put it through its paces. After a few pulls of the cable, the engine should sound better because the fresh gasoline flows through it.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Reason #6: Leaks on the Carburetor Gasket<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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When I work with carburetors, I rely on gaskets to prevent any leaks into the engine. If these gaskets fail, they can let extra air into the combustion chamber. And if you\u2019re thinking this might change the mixture and make the lawnmower\u2019s engine rev faster, you\u2019d be absolutely right.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Solution: Change the Gasket and Secure the Mower Carburetor\n<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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After you clean the carburetor, reinstall it and ensure the gaskets are removed during the removal process. Simply reviewing the procedure will remind you which steps you can safely omit.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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