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Bought this particular set for a ZX14 and they work great. NGK is the only brand I have bought for any of my bikes and my bike mechanic friends say NGK is the only way to go.
This is the exact same plug as my OEM plug but cost seven bucks less per plug because the box doesn't say Honda on it!! Thanks Motosport! CBR600 F4I
They seem to do what a spark plug does. I bought a used bike and changed them right away so cannot really claim better performance. They do just fine, i have a great running engine. 2008 gsxr 600
Use these in all my bikes! Motosport has the best price and shipping is FAST!