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i know i just bought my 99 zr with 9's in it, i run 91 octane fuel all of the time and the book says that the stock plug is a 10, but right now it runs really well without any problems. If you were running better with the 9's why not go back to them? Might take a little fiddlin to get em just right. i don't know thats up to you, a 10 plug is hotter right?
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04 F7 Sno Pro
99 ZR 700
99 ZL 600
00 ZR 600
99 ZRT 800
~Ride Hard Or Go Home~
~Work Hard - Play Hard~
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