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Questionable spark


J A Boggan's Avatar
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05-31-03, 11:12 AM   #1  
J A Boggan
Questionable spark

When I put a B&S spark tester on my weed eaters and blowers I get a nice fat spark (with a 1/8" - 3/16" gap) from plug wire to ground, on every pull. However, when I connect the new spark plug from plug wire to ground, I get only a measly small spark. Apparently, it is good enough for it runs the engine fine. Dose anyone know why this happens.

 
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mower17's Avatar
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05-31-03, 12:10 PM   #2  
You might need to clean and regap the plug.

 
cheese's Avatar
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GA

05-31-03, 11:45 PM   #3  
Spark plugs have internal resistors. They can change the appearance of the spark. Also the gap on a spark plug is usually smaller than the gap on testers. This makes a smaller spark too.


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J A Boggan's Avatar
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06-01-03, 06:43 AM   #4  
J A Boggan
Thanks Cheese...Is a DJ7Y Champion the same as a RDJ7Y, without the resistor?

 
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06-01-03, 12:08 PM   #5  
Joe_F
Yes, the first R in a Champion plug number denotes resistor.

 
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06-01-03, 02:09 PM   #6  
Not to but in, but, what is the purpose of the resistor in the plug. Is there an advantage with using a plug with a resistor?

 
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06-01-03, 06:29 PM   #7  
J A Boggan
It is supposed to reduce electrical interferrence.

 
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