Garden

Experienced gardeners share their insights in answering this question :
Take the cover off the top of the engine. (recoil). check to see if the mechanism is free. it may just need taken apart and cleaned.

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

Afterfire occurs after the engine has been shut off. Common Causes of Afterfire: Shutting off the engine at high RPM, causing fuel to pump through the engine for ignition. Gasoline that contains alcohol has a tendency to ignite easier, which can cause afterfire.
A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
Clogged or Dirty Air Filters

Dirty air filters are one of the most common reasons lawn mowers sputter. Dirt can be present in the apertures that lead from the carburetor and the fuel filter and interrupt the flow of fuel supply to the combustion chamber. You want to be sure to clean or replace dirty air filters.

There are a number of things you may do while operating your mower that can cause a backfire, and there are way to avoid them. The primary cause of a backfire is decelerating too quickly. The simple fix for this is just to lower the engine speed a bit more gradually.
You can either clean the air filters, or you can replace them with new ones. If you have a foam filter, you can clean it with a drop of dish soap and warm water. Remember to air-dry them before using them again. But if you have paper air filters, you must replace them during the maintenance of your mower.
Worn bearings about to fail completely often make grinding noises, as well as unusual vibrations. The mandrels holding the mower deck`s cutting blades contain two bearings that need frequent lubrication to keep the bearings working properly. As bearings dry and overheat, seals fail and dirt enters the mechanism.
Common signs include reduced engine performance, black smoke coming from the exhaust, backfiring, overheating, or hard starting.
Use Carburetor Cleaner

Fortunately, you can generally do this without even taking the carburetor out of the engine. Start by purchasing some commercial lawnmower carburetor cleanerOpens a new window, which comes in a simple spray can and will make it easy to clean the inside and outside of the carb.

This sound is the result of friction from the gear teeth meshing inside the transaxle casing. These gears will wear slightly over time, and this sound should decrease. If the noise suddenly becomes louder, we suggest that an authorized service center inspect the unit.
What are the symptoms of bad gas? If your lawn mower is difficult to start, idles roughly, stalls out, or makes a “pinging” sound, you may have a case of “bad gas”.
The primary cause of a backfire is decelerating too quickly. The simple fix for this is just to lower the engine speed a bit more gradually. If you have a throttle that you use to reduce speed, gradually let it up instead of letting it rebound quickly.
When an engine is running rich, it has too much fuel and too little air, which slows down the combustion process. When combustion doesn`t happen in a timely manner, the exhaust valve opens while the air-fuel mixture is still igniting, causing this explosion to “spill” out of the cylinder, making a loud popping noise.
Lawn Mower Backfires Through Exhaust

If a lawn mower is not properly maintained and serviced, it can cause the engine to run too rich, resulting in the fuel and air mixture igniting too late and causing a backfire. Other common causes of backfiring include a dirty air filter, faulty spark plug, or a clogged carburetor.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Troy Bilt Lawn Mower pull Cord broken
ANSWER : There should be four bolts holding the cover on that houses the pull cord assembly take the bolts out look inside you should see the rest of the broken cord at the other end there is a spool that the cord rolls up in to pull the cord until it stops the other end of the cord is a not in the cord pull on the knot the broken peice should come out turn the spool 2 times in the direction that is against the pressre while holding the spool in place feed the new cord in through the whole that you pulled the broken cord out of then tie the cord in a knot wind the rest of the cord up then feed the other end of the cord through the new pull handle tie the cord in a knot put the housing back on

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What to do when craftsman mower pull cord won’t recoil?
ANSWER : Sounds like the spring inside the recoil has either broken or let go so it won’t recoil. If you are lucky it could be the wheel that the cord goes on is seized or stuck. You can take the recoil off most mowers by taking out two or three screws and lifting it off the engine. They can be repaired but it takes time having to be careful the spring won’t spin and hurt you. I have even taken a recoil off another engine and if the holes for the little screws don’t line up just drill little holes beside the old ones and reinstall the little screws.
I even used a 18 volt cordless drill to crank the engine using the bolt on the fly wheel and the right size socket. Leaving the recoil off You have an electric start that way.

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I can’t start it because the pull cord is stuck and it happened after I installed a new blade.
ANSWER : If the recoil assembly has three screws holding it in place, remove them, lift the recoil assembly off and see if it works off the mower. If it does, reassemble.
Gary

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Just installed a new pull cord…the cord does not retract. How do I fix the problem?
ANSWER : The best way i found is to twist counter clock wise a dozen turns,hold the spool with vise grips,feed the roop through all holes you need to go through, into the reel knot, i burn the knot, keeps it from slipping out,then slowly let the spring bring the slak in when i release the vise grips!

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Pull cord is difficult to pull after third pull becomes stuck but will turn if pull hard repeats every three to four pulls.
ANSWER : No response to clarification request.

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10 year old Toro 2017 lawnmower, suddenly stopped while cutting grass. Oil quite low. Cannot pull cord more l than few inches.
ANSWER : When you pull the cord does it hit a hard stop and not go any further or does it get really difficult?

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Pull rope repair
ANSWER : Try removing the housing. Many times it will just get jammed. If it goes back in then realign and try again. If not, the spring may be broken and need replaced.

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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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