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Won't start i've had this lawn mower for 6 years ad it's worked great with no problems until i tried starting it today to mow the grass

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  • kglynn90
    kglynn90 Apr 22, 2013

    Also when I managed to start it it'll run until I let go of the throttle. It'll shut off and not idle like it's supposed to

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  • Craftsman Master
  • 7,482 Answers

Hi kglynn90
Make sure you are getting spark at the spark plug, to do this:
Remove your spark plug and check to be sure you are getting a bright blue spark at the spark plug.
You do this by grounding the plug on the head of the engine and cranking the engine or by pulling the crank rope...watching the plug for spark.
If you are getting a nice blue spark then skip A below and go to B.
A...If you do not get a nice blue spark then you may need to replace the electronic module.
Note: If you have to replace the module be sure to measure the position it is in, it is critical to starting.
Take a picture for later reassembly.
B...Also take some fine grit sandpaper (not emery) and lightly sand the flywheel where the magnet is located to clean any rust or corrosion from the magnet area.
Then follow the procedure below:
------------------------------------------------------------------------------------
Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Write down on a piece of paper and or take a picture of how the linkage attaches to your carburetor for later reference when you go to reinstall your carburetor.
Mark each piece with a awl, or some kind of sharp instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using a very small shot of starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line/s condition...after a while they will degrade and need replacement.
Check/Clean/Replace your fuel filter if you have one.
When you remove your fuel lines from the carburetor be sure to make a drawing or take a picture of how the lines are connected to the carburetor.
Also a good time to take a picture for later reference for reassembly.
If the mower is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
Please take time to rate me
Bud

Posted on Apr 23, 2013

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SOURCE: Problem mowing my lawn.

I had the same problem and I already found those recommended solutions\ causes on the web:
1. The motor isn't on full throttle.
2. The blade is upside down.
3. The grass is too high when cutting it.
4. Overlap your cuts.

It helped my problem/ I hope it will help yours too!

Posted on Sep 01, 2008

MNfisherman
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SOURCE: lawn mower won't start

Carb is most likely gummed up and will need cleaning. Anytime a gas motor is store through a season, you should use a product called "stabil" in the gas to prevent gumming up. Also check that there is a strong spark coming from coil. To do this, remove spark plug, hook it up to the coil and set it on motor block and pull it over. You should see a strong spark. If you don't see the spark, then either the coil is faulty or the magnet from coil to flywheel is not getting good contact.

Posted on Jul 03, 2009

heatman101
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SOURCE: My lawn mower won't start. It needs oil. It

Hi,
Yes... most have oil sensors which shut them down bwfroe damage is done...and if not what can it hurt now???
Put oil in it and try it..

heatman101

Posted on Aug 04, 2011

hunter19_46m
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SOURCE: I have weed eater/poulan 22" push lawn mower. It

Hi goldengear...

Make sure you have installed the blade on the right way, if it is installed upside down then it will "beat" the grass instead of cutting it and make a terrible cut, also make sure the blade is good and sharp.
The rough running may be due to trash in your carburetor, I would advise to clean your carburetor and also check you fuel tank for trash, water,etc. if there is any trash,water,etc in there then you need to also clean the fuel tank.
Do one more thing and check/clean/replace your fuel filter if you have one.
Please take time to rate me

Posted on Aug 18, 2011

  • 2239 Answers

SOURCE: I bought a craftman lawn mower 6.75hp. I only used

If it has been stood with the same fuel in it for any lenght of time, then the fuel will go bad, drain the fuel and re fill with fresh fuel, if there is a bowl drain on the carb slacken this and drain the bowl, now try again, if it does not sort itself out after a lenght of running then will need to remove the carb float bowl and blow an air line through the jets.

Posted on Mar 01, 2012

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