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NGK is arguably one of the best plugs out there. My experience has proven their quality is consistently the highest. When I run a resistance test I always get similar numbers for the life of the plug. For a Harley, Champion is stock and a good choice; however, when I've run a resistance test I have had huge differences even when out of the box new and looking new. I can't enplane it, it's just the facts. Resistor plugs are needed to reduce radio static but high resistance is weaker spark giving unequal fire to the other calendars. Not good, NGK good.
Verified purchase: Yes | Condition: New
Good quality plugs for my bike
Verified purchase: Yes | Condition: New
Its what is recomended for my bike so thats what i use. Seem to be good but when they die they all die? Dont ubderstand that one ??
Verified purchase: Yes | Condition: New
Good reputation, used in my Top Alcohol Dragster for the last 20 years, no fails...
Verified purchase: Yes | Condition: New
bought for a great price to keep on hand for a road trip.
Verified purchase: Yes | Condition: New
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