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Spark plug?

Jack B.'s Avatar

Join Date: Jul 2003
Posts: 590

08-09-03, 07:27 PM   #1  
Spark plug?

I have a Homelite string trimmer that slowly got to where it was VERY hard to start. I pulled the plug and grounded it and got a fat blue spark. Anyway, I changed out the plug and it really runs fine now. Is this a case where a "spark plug under pressure tester" would have showed up something?

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cheese's Avatar
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Join Date: Jul 2001
Posts: 16,571

08-09-03, 10:56 PM   #2  
Possibly...don't know for sure. Sometimes these things happen for wierd reasons.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

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Futures1's Avatar
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08-12-03, 08:05 AM   #3  
Chances are it would have showed.

Pick up a spark tester at a small engine dealer, they have a 1/4 inch or more gap and will usually give you a go or no go. I assume your trimmer is a 2 cycle (Gas & Oil mix). Look for oil between the porcelain and electrode of the plug. This is usually the indicator of a "grounded spark under compression" condition. You can sometimes get the plug to fire by cleaning out the oil with alcohol or lacquer thinner !!. Best to keep a spare plug on hand for 2 strokes )
Dick S.

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