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Old 04-13-2014, 09:51 AM   #1
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Tecumseh - Weak spark


Yardman shredder/chipper 8hp - "weak spark". I've replaced SS ignition, spark plug, cleaned and gapped magnet, kill switch OK - still very weak spark?????? HELP!

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Old 04-13-2014, 12:04 PM   #2
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Tecumseh - Weak spark


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Yardman shredder/chipper 8hp - "weak spark". I've replaced SS ignition, spark plug, cleaned and gapped magnet, kill switch OK - still very weak spark?????? HELP!
Did you check under the flywheel to see if the underside was rusty? Sometimes the pickup will corrode also.

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Old 04-13-2014, 07:35 PM   #3
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Tecumseh - Weak spark


Excuse my ignorance but what pickup? I did have the flywheel off but just to see how the magnet was attached.

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Old 04-13-2014, 08:43 PM   #4
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Tecumseh - Weak spark


The pickup is a coil looking deal with two metal prongs that are very very close to the inside of the flywheel.
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Old 04-14-2014, 02:36 PM   #5
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Tecumseh - Weak spark


You've got me stumped. . . I have a 8hp Tecumseh with SS ignition. I have a module (laminations) that is gapped .012" from the magnet on the flywheel. One wire from this module is a spark plug wire and the other is for the kill switch ( ground). I'm assuming this SS module contains circuitry to duplicate the points and condenser. With the new module and spark plug I still get a very weak spark???????
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Old 04-30-2014, 11:37 PM   #6
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Tecumseh - Weak spark


Are you turning the flywheel by hand or using the starter or pull rope ? Turning by hand was efficient for testing for spark when points and condenser were used, by now with SS ignition that method no now longer works.
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Old 05-01-2014, 07:17 AM   #7
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Tecumseh - Weak spark


sometimes a new module can be bad..i would also put in a new flywheel key while i had it apart
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Old 05-01-2014, 08:51 AM   #8
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Tecumseh - Weak spark


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Yardman shredder/chipper 8hp - "weak spark". I've replaced SS ignition, spark plug, cleaned and gapped magnet, kill switch OK - still very weak spark?????? HELP!
When I got the module they said "NO RETURNS ON THESE UNITS" which either tells me "they wanted to do the work" , or "there have been problems with these modules" ?????
I have been testing by re-assembling and using the pull rope looking for spark at the plug!
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Old 05-01-2014, 01:36 PM   #9
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Tecumseh - Weak spark


There haven't been returns allowed for years on electrical parts. Would you buy one that has been returned? Are you sure you are grounding the plug to check for spark? I use one of these.
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Old 05-01-2014, 01:49 PM   #10
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Tecumseh - Weak spark


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When I got the module they said "NO RETURNS ON THESE UNITS" which either tells me "they wanted to do the work" , or "there have been problems with these modules" ?????
I have been testing by re-assembling and using the pull rope looking for spark at the plug!
I use a jumper wire with a clip on the plug threads and on ground, I get an occasional spark but very weak. I have checked the flywheel key - It's good.
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Old 05-01-2014, 11:54 PM   #11
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Tecumseh - Weak spark


Although extremely rare it does happen that the magnets strength has decreased. I hold a screw driver loosely about 1/4" away. It should pull it in. This method always worked for me

I soldered an alligator clip to a "test" spark plug to check for spark
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Old 05-16-2014, 10:03 AM   #12
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Tecumseh - Weak spark


Hello,

A couple of items can cause weak/erratic spark on a Tecumseh (or Briggs & Stratton) engine.

1. Re-check your coil-to-flywheel gap. Most small engines run well with a gap of .003-.007 A business card is very good for setting the proper gap.

2. Check the flywheel key. If the key is even slightly sheared, it can cause weak/erratic spark. Replace the flywheel key.

Hope this helps.

Mark P.
Central State Mower, LLC
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Old 05-19-2014, 05:57 PM   #13
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Tecumseh - Weak spark


I finally solved the weak /erratic spark - I ended up taking it in to a shop and they replaced the "new" coil module.
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Hello,

A couple of items can cause weak/erratic spark on a Tecumseh (or Briggs & Stratton) engine.

1. Re-check your coil-to-flywheel gap. Most small engines run well with a gap of .003-.007 A business card is very good for setting the proper gap.

2. Check the flywheel key. If the key is even slightly sheared, it can cause weak/erratic spark. Replace the flywheel key.

Hope this helps.

Mark P.
Central State Mower, LLC

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