Question about Black & Decker 19" Electric Lawnhog Mulching Mower with Rear Bag

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Lawnmower problem my lawnmower is hard to start and will not stay started after it does start? I Have replaced the spark plug and re placed with new gas and oil..any help you can give please?

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  • lmcclellan18 Aug 25, 2008

    MY LAWNMOWER WILL START UP BUT WILL NOT STAY STARTED. I HAVE CHANGED THE SPARK PLUG AND PUT IN NEW GAS AND OIL. CAN YOU PLEASE HELP ME FIX THIS PROBLEM? i HAVE A TROY BILT MOWER (PUSH MOWER)

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My lawmower can"t start

Posted on Jun 06, 2013

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For trouble shooting & repair check out www.smallengineadvisor.com for problem solving etc.

Posted on Jun 17, 2008

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Didn't winterize my Husquarna 21 hp Kohler riding lawnmower last year.


Dave, grab some gun out or any old carburetor cleaner... remove spark plug, spray a few squirts into the hole then reinstall the plug. Now go to the carburetor, spray some into it as well....

Try starting it , if it starts and runs for a matter of seconds then your carburetor needs to be serviced...and THAT you can do yourself...trust me. If you need help on how to do it, I will send you a link for a you tube video.

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Mowing at mid throttle, suddenly the engine started over revving. Acts like governor isn't working. Every time I try to restart it instantly starts to over rev.


According to Amie Taylor on http://homeguides.sfgate.com/lawnmower-revs-up-down-100220.html "Airflow Issues A lawnmower that hunts and surges may be experiencing something as simple as an airflow issue. If the air that the engine requires to run is blocked, especially sporadically, it can cause the engine to slow down. When the blockage moves or clears, the engine may suddenly rev up in response. To fix this type of problem, check the air filter to ensure that it's not clogged with dirt and debris. Check the vented gas cap as well. Both issues can cause reduced or sporadic air flow, and clearing them will fix the problem.
Spark Plug Problems Another problem that can cause revving and dying of a lawnmower engine is a faulty or poorly adjusted spark plug. Check the spark plug to see if the wire is connected to it firmly and not wobbling about. If it is connected correctly, remove the spark plug to see if it's covered with corrosion. If so, a simple scrubbing with a wire brush can restore it to working order. If necessary, replace the spark plug with a new one. Check the spark plug gap with a spark plug gauge to ensure that it's adjusted to the proper setting recommended in your owner's manual.
Carburetor Adjustment A carburetor that's incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. One screw controls the idle speed while the other adjusts the idle mixture. Check the manual if you're unsure of the location of the idle adjustment screws. Start the mower and allow it to run for 5 minutes. Then slowly adjust the screws tighter or looser in turn until the mower runs and idles smoothly.
Fuel Problems A particularly simple fix that can be at the bottom of many lawnmower idling problems is old or contaminated fuel. If the fuel has been left in the mower while it was stored over the winter or while the mower has remained unused, drain it and replace it with fresh fuel. If you have gas-powered blowers and trimmers that use a mixture of 2-cycle oil and gasoline, check to see that you've not placed that mixture in the lawnmower inadvertently."

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Check for spark. Is the plug fouled? Have you hit anything lately with the blade?

Jul 19, 2013 | Riding Mowers & Garden Tractors

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I have a yardman lawnmower it has gas, oil level is good but wont start,even after priming, priming is 3 pushes of the prime button, i did as directed and still wont start after pulling the cord for 15...


If the fuel pumped when you prime then the next step would be to check the spark. This can be done by removing the spark plug and then reattaching the wire to the plug and grounding the plug to the engine block. Then you need to have someone to try and start it, while watching for spark. It is easier to see if this is not done in bright sunlight. If no spark seen or heard, then it is either the spark plug or the ignition module, most likely the spark plug. If you have another machine available you can pull the plug wire and hook it to the plug from your mower and ground it to the block and try starting. If you get good spark, then the problem is the ignition module, if no spark, then replace plug.

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1 Answer

I used my tiller one time and the second time I used it, it was hard to start and when she did, she blew white smoke and would not start after that.


This happens frequently after a tiller, mower, snowblower, etc. sits for a season. Your tiller is probably flooded due to a stuck carb float. You can try a quick fix by tapping gently a few times on the float bowl, then pulling the spark plug and cleaning it with a wire brush, and then wiping it dry with a cloth. If you have a new spare plug to install, that is even better.
Try to start your tiller again, and if the same thing happens, your float is still stuck and you may need to have your carb serviced.
You can try one more alternative if you do not want to go through the bother and cost of having your carb serviced (or purchasing a kit and trying to do it yourself), but it is a 50/50 "hit or miss" sometimes it works, sometimes it don't type thing:
Drain all the gas out of your tiller. put about 2 ounces of carb/injector cleaner in the tank, and top off with gas. Give the float bowl a few taps. Now, pull the spark plug..... make sure the spark plug wire is at least 1 inch away from any metal. With the throttle set to full and the spark plug removed, Pull the starter cord 5 or 6 times (if you have electric start, crank it for about 5 seconds). You may see some vapors come out through the spark plug hole- this is OK.
Clean, install, and connect your spark plug (again, a new plug is even better). Give the bowl a few taps for luck, and try and start your tiller again. If the procedure worked, your tiller may run rough for 10 or 15 seconds (maybe even up to a minute or so... let it take its course!), but then smooth out.... if it stalls, don't worry.... Start it back up.
This will often work for tillers, snowblowers, mowers, generators.... pretty much any 4 stroke "lawnmower engine". It all depends on how badly the float is stuck after the engine sits.
You can minimize having this problem in the future (it may still happen, but less often and less severe) by adding a good fuel stabilizer (such as the brand name STA-BIL) to your gas and running for 10 minutes or so before you store your "lawnmower engine" for the season.
If you still have problems, the likely cause is a stuck carb float and the carb will need to be serviced.... but hopes are high that my solution helps!
Good Luck, and Thank You for using FixYa!

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Next squirt a little gas into spark plug hole, replace the plug...will it fire up? If so...start working your way back down the fuel system....carburetor, fuel lines, fuel filter and gas (is gas old or new? is there any water in it?)

try that...www.nnyparts.com

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First,make sure you are sitting in the seat as the seat has a safety switch under it that will prevent it from starting if noone is on it.
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If you have spark and fuel and it still won't start,It is a timing issue.

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