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service my 172

would'nt bother with uprated spark pkugs. Reanult have released a tech note about this. some aftermarket ones mess about with the k-line/diag-line. basically the computer measures the spark plug resistance to determine if it misfiring or not. when no gen ones are used it messes up this measurement.
 
Yep, my old cup ones were missing the tips on some lol (@50k)
 
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