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Learn me about NGK sparkplugs...
Why do some NGK sparkplugs (for smaller motors) cost twice as much. I run NGK plugs in everything I own (cars, boat, m/c, small motors) ...have for decades. Why is it that most of my small engine stuff uses BPM8Y which cost about $22 for a box of ten, yet my Stihl chainsaws use BPMR7A which run $45 per box...I think the R designates "Resistor"...what's the difference, and why twice as much?
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