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Old 05-25-2005, 11:35 AM
EX20 EX20 is offline
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Join Date: May 2005
Location: Milwaukee, WI
Posts: 7
Ignition Coil Pickup Distance from the Flywheel

I have a 9 year old McCulloch 2816. Yes, I know it's a piece of crap after reading all these posts for awhile. But, it has been fairly decent for my needs of home use. I almost ready to dump it and get a Shindaiwa, but I'm putting in one last ditch effort to fix it.

My problem is that I'm getting barely any spark, if any at all. It has always been weak since new. I've seen some posts on coil pickup distance from the flywheel vs timing, but does the distance affect the amount of energy the coil produces. I think my spark is weak or non existant because the gap is too big. There is some slight adjustment, from right on the flywheel to about a 1/8". I think it has been set wrong since day one.

I'm getting a new plug tonight to eliminate that possibility first before readjusting the gap.

Any ideas?
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Old 05-25-2005, 12:03 PM
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partstree partstree is offline
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Join Date: Mar 2005
Location: Austin, Texas
Posts: 79
unfortunately mcculloch has been known for ignition problems. mcculloch usually uses a 0.025" plug gap for their gas products.

if you can get a visible spark during cranking, ignition is most likely fine. if the spark is really weak, try cleaning the coil and realigning the magnets
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Old 05-27-2005, 12:22 AM
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Mikes Machines Mikes Machines is offline
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Join Date: Jan 2004
Location: Medina, Ohio
Posts: 112
While there can be many causes for weak spark, the air gap between the flywheel and the coil is critical. Most engines need about .012" to make a good spark.
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Old 05-27-2005, 01:15 AM
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KINGjosh KINGjosh is offline
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Join Date: Sep 2004
Location: North Florida
Posts: 532
I usually just use a regular bussiness card. The thickness of that has always worked for me.
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Old 05-27-2005, 11:12 AM
EX20 EX20 is offline
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Join Date: May 2005
Location: Milwaukee, WI
Posts: 7
I readjusted the gap to as little as possible without rubbing on the flywheel and sure enough it started right up and kept running.

I pulled the spark plug out so there would be no compression resistance and set the gap so that I felt a really good magnetic "pull" when the flywheel magnets went by the coil. I could really feel the magnetic attraction to the coil pickup. There was barely any before closing the gap.

Thanks for all the input.

Oh, by the way, anyone need a new coil assembly for one of these motors. Here I bought one without checking the gap first. Oh well, live and learn.
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