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Can anyone please tell me which spark plug they use as a replacement? I've had my 05 500 S for about a year now and I'd like to replace the spark plug. Any recommendations or places to purchase? Thanks!

Ryan
 

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no, the 450 is a NGK DPR7EA-9
optional is NGK DPR6EA-9 (HOTTER PLUG)
optional is NGK DPR8EA-9 (COLDER PLUG)

NGK is differnt from other plug manf.. the higher the number the colder the plug.. BTW.
anybody else need a S-plug PN?
 

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what is the purpose of a hotter or colder plug?
 

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QUOTE ("harry":1f52r3no)
what is the purpose of a hotter or colder plug?
That's what i'm wonderin'. What is better? Which should you run?
 
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