Spark plug?


Old 08-09-03, 07:27 PM
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Location: Montevallo, Alabama
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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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Old 08-09-03, 10:56 PM
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Possibly...don't know for sure. Sometimes these things happen for wierd reasons.
Old 08-12-03, 08:05 AM
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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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