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I have a z400 with 440 big bore kit, stage 2 hot cams, 39mm FCR carb, velocity intake, can anyone tell me what spark plug to use? Thank you
 

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NGK CR8E is what I ran in the 462 and it ran great. CR7E is stock.
 

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The 8 is a colder plug. If you’re running a higher compression than stock, or longer duration cams, then cylinder temps get higher, requiring a colder plug.
 
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