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champion vs NGK cross reference chart

would an 8 help with power??

has anyone tried or considered running hotter plugs in a sled? ie, an ngk 8 rather than i 9. i've always ran a 9 and so does everyone one else i know. would an 8 burn more completely, hence more power? or would it just burn hotter, causing more burn downs? or do i just completely misunderstand the purpose and reason behind hotter/colder plugs?

pv
 
The used Polaris 500 I just bought for my kid, the sticker under the hood says N3 (B8), but it has B9's in it. They both look evenly dark, so I thought i should go back to the factory recommended plug. This is an older 500 EFI Polaris indy. No carbs to dial in.
 
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