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Spark plug has no spark

My trimmer was running but poorly and the primer bulb split. I replaced the bulb, fuel lines, filter and spark plug. For a couple of times it would start with the help of carb. cleaner then after that nothing. I found that the spark plug is not getting any spark, what do I do??

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  • Master
  • 1,807 Answers

Check the on/off switch, Check the timing gap between the flywheel and ignition module.

Posted on Jul 29, 2013

  • 2 more comments 
  • Bob Murray Jul 30, 2013

    OK I checked the ON-OFF switch and it has continuity, now too small of a gap between the maganet on the flywheel and the module create a problem? I can see marks on the flywheel from where it has hit before, it's not now but you can't get a thick business card between the two. Could that cause the no spark or could it be a bad module. where

  • Plink-plonk
    Plink-plonk Jul 30, 2013

    The ignition module shouldnt touch the flywheel. The magnet in the flywheel passes the module to create the spark, too far away and the spark wont be strong or consistant. The spacing should be a 0.25 feeler guage or the thickness of a standard thin card business card.

  • Bob Murray Jul 30, 2013

    OK the module is closer than it should be, I will adjust it to where it should be. Is there anything else that would keep the module from creating the spark? Is there any way to test the module other than using a spark tester or using the plug to see if there is any spark?

  • Plink-plonk
    Plink-plonk Jul 30, 2013

    You may be able to use an voltmeter to see what the resistance and output is. I dont have the figures for what a functioning one should produce. The gap between the flywheel and ignition module is what gives you the \'advance\'/\'retard\' on the spark.

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Sounds like you need to take the carb. apart and clean it. I like to use a Den Tek Brush, (used for cleaning teeth), to clean the small ports in carb. they work great for this job. Make sure to either clean or replace the small screen in thcarb. as well.

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SOURCE: the primer bulb does not draw fuel thru carb

you need to buy a primer bulb kit and replace it cost about $8.00 and is easy to put in, the check valve is damaged.

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Posted on Sep 10, 2009

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Make sure the line is near the botto ofthe tank.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

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You have done and are doing exactly what is necessary to solve your problem.
Lastly: remove your carburetor and clean it thoroughly using carburetor cleaner available at most auto parts stores. Replace the diaphragm and metering diaphragm. Diaphragms become stiff with age and with modern fuels and will not pull enough of a fuel-charge into the combustion chamber.

Posted on Sep 27, 2010

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