Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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I am not getting any spark at the Spark Plug. I sanded all the magnetic parts on and in the flywheel. I have a new battery and it's fully charged. I checked the ignition switch with Electracal Tester. Need help. thank you.

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If the spark plugs are good then you will need a new magneto/coil. I am assuming all the safety switches are good, as this would also cause the mower not to start/spark. Hope this helped Tim

Posted on May 22, 2011

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Hi Paul

To make sure you are getting spark at the spark plug,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 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 distance between the flywheel and the coil and be sure to install the new one with the same clearance
Normally the clearance is around .18 thousandsands...(you can also use a business card for the measurment)
Or write the measurement down on a piece of paper for later reference, this measurement is critical to starting of the engine later.
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.
You can also try to lightly sand the module metal face to increase the possibility of ignition of the old module before replacement.
Please take time to rate me
Bud

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1 Answer

Troy-bilt 27 cc tb80ec string trimmer Will not start, tested spark plug, getting no fire to spark plug


Hi Paul
To make sure you are getting spark at the spark plug,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 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 distance between the flywheel and the coil and be sure to install the new one with the same clearance
Normally the clearance is around .18 thousandsands...(you can also use a business card for the measurment)
Or write the measurement down on a piece of paper for later reference, this measurement is critical to starting of the engine later.
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.
You can also try to lightly sand the module metal face to increase the possibility of ignition of the old module before replacement.
Please take time to rate me
Bud

Mar 22, 2013 | Garden

1 Answer

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Hi

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 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.
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.
Please take time to rate me
Bud

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1 Answer

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Hi key son...

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 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.
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.

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1 Answer

I have the Briggs and Stratton Engine. Will not start. Don't seem to have any spark.


Hi petercorgiat...

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 pulling the crank rope, if you are getting a nice blue spark then:
You need to pull the flywheel off of the motor, and on the flywheel where the magnets are lightly sand that area with sand paper and try again to see if you have spark.
If no spark then you have a faulty ignition module...check the clearance of the module to the flywheel, it should be about a thickness of a paper match book cover. Keep this clearance in mind in case you have to change the module because you will need to set the module to the same clearance..
Please take time to rate me

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2 Answers

Xt 500 has weak spark(flywheel magneto with ignition points).poor when cold and now won't even start.fuel fine.isolated ignition(magneto,coil and points).changed coil.points fine,resistance...


It sounds to me that you have done most all of what is needed. Just take some fine sandpaper to the magnets in the flywheel. After sanding, wipe it clean, then spray it with carb cleaner to remove any possible residue. Now give the magnets a spray coating of clear polyurethane coating. The flywheel will never rust again. Replace the source coil and install a new spark plug. A plug that is carboned up can lessen spark voltage. The last item is the battery. A weak one can rob power. Please rate my answer. Thanks.

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1 Answer

Have a very old tractor that the magneto isn't sparking


another thing you should check is see if the flywheel key is in good shape even if there is a small nick in the key that would prevent it from sending a spark to the plug also check the magnets on the flywheel if they are rusty that would act the same way. sand the magnets just untill the rust is gone(don't rub to hard the last thing you want to do is remove to much of the magnet then you'll have to regap the magneto)....good luck

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1 Answer

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