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Garden Tractors Discussion Forum

Briggs Stratton - weak spark = Ignitor??

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Todd Manley

06-24-2005 07:03:44
66.195.2.101



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I have researched and read here on this forum about many times if you have a weak spark it most likely is the ignitor...but...I cant find this ignitor? Is it UNDER the Flywheel??

I have a JD L120 with a 20HP Briggs and Stratton Itek V-Twin motor....

getting weak spark...cleaned both flywheel magnet and coils....but not working. I dont see where a ignitor could be on this motor and the JD parts does not show an ignitor part # for this mower??

any help appreciated. also..what size nut is on the flywheel if it has to come off..looks like 1.25 socket??

Thanks for your time !!!!

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stronics

06-25-2005 11:43:31
216.96.126.168



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 Re: Briggs Stratton - weak spark = Ignitor?? in reply to Todd Manley, 06-24-2005 07:03:44  
The diodes in the dual kill wire like the other gentleman says can cause havic. When you check the spark is it blue or pinkish red? If pinkish part of the coil is shorted changing the output voltage. It will appear usually when the engine gets hot. Check the diodes first then think about the coils.
David



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echomasterservicetech

06-25-2005 02:40:18
4.245.25.139



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 Re: Briggs Stratton - weak spark = Ignitor?? in reply to Todd Manley, 06-24-2005 07:03:44  
PLEASE USE CAUTION IN REPLACING COILS FOR A WEAK SPARK CONDITION,ESPECIALLY WITH A MACHINE AS NEW AS YOURS.AN INLINE SPARK TESTER IS THE ONLY ACCURATE WAY TO TEST SPARK QUALITY. IF ANY SPARK AT ALL IS CREATED COILS ARE GOOD,THIS PARTICULAR MACHINE HAS NO IGNITOR.IF YOU WISH E-MAIL YOUR SYMPTOMS THAT LEAD YOU TO LOOK AT SPARK. I AM CERTIFIED JOHN DEERE MECHANIC AND WOULD LIKE TO SAVE YOU SOME MONEY

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Kent of SW MO

06-24-2005 13:45:24
12.178.152.153



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 Re: Briggs Stratton - weak spark = Ignitor?? in reply to Todd Manley, 06-24-2005 07:03:44  
Todd,

Pull the kill wire from both ciol and then check your spark. If I remember right the kill wire harness has two doides to isolate the coils from each other and if one diode goed bad it can affect both sides. If the engine will run ok when you pull the kill wire from both coils all you need is the kill wire harness.

Kent



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don watts

06-24-2005 09:41:42
4.90.4.99



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 Re: Briggs Stratton - weak spark = Ignitor?? in reply to Todd Manley, 06-24-2005 07:03:44  
todd there talking about the solid stae module which is located outside the flywheel with both spark plug wires.now .u shouldnt have to pull the flywheel.but now BE SURE TO SET THE AIR GAP BETWEEN THE FLYWHEEL AND THE COIL.I NORMALLY USE A CEREAL BOXTOP AND IT WORKS.but thats what the ignition module is. good luck don



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Todd Manley

06-24-2005 09:45:57
66.195.2.101



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 Re: Briggs Stratton - weak spark = Ignitor?? in reply to don watts, 06-24-2005 09:41:42  
Damn...Thanks don...Did exactly that ( got that from the forum too) all cleaned and gap...

so..then that leaves only one thing to do...Get new coils right?! I mean..NOTHING else in the mix then seems like it could be wrong...

New plugs gapped properly....cleaned coils and regapped them...and cleaned magnet on flywheel...

I've done it all right>? Just seams weird BOTH coils would go at the same time...

OK..thanks guys..I guess I will order 2 magneto/ armeture/coils.....

Thanks

Todd

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Rhoderman

06-24-2005 15:04:21
63.77.94.2



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 Re: Briggs Stratton - weak spark = Ignitor?? in reply to Todd Manley, 06-24-2005 09:45:57  
Could it be bad magnets in the flywheel??

Magnets go south when they get hot, but they usually return when cooled. But since you say you're having problems with both coils (which I agree doesn't make sense)...

I think I'd try putting the coils closer to the flywheel, just be careful they don't crash (bad).

Is there any way you could have a bad ground at the coil?

Did you fully disconnect the mag kill wire? Maybe you have something that's slightly resistive there and it's pulling the coil high voltage down, but not quite enough to kill it.

Just throwin' suggestions at ya...

- Rhoderman

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