Questionable spark

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  #1  
Old 05-31-03, 11:12 AM
J A Boggan
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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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Old 05-31-03, 12:10 PM
mower17's Avatar
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You might need to clean and regap the plug.
 
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Old 05-31-03, 11:45 PM
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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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Old 06-01-03, 06:43 AM
J A Boggan
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Thanks Cheese...Is a DJ7Y Champion the same as a RDJ7Y, without the resistor?
 
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Old 06-01-03, 12:08 PM
Joe_F
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Yes, the first R in a Champion plug number denotes resistor.
 
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Old 06-01-03, 02:09 PM
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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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Old 06-01-03, 06:29 PM
J A Boggan
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It is supposed to reduce electrical interferrence.
 
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