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212 Posts
Discussion Starter #1
What type of racing fuel are you guys/girls using or are you just running pump gas?
 

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89 pump gas now but im upping the comp and i might switch to u4
 

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inappropriate
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7,728 Posts
87 baby!
 

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We have to run the new U4.2, it sucks.
 

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Funshine Bear
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man, I pay for 91. Am I missing something? Whats up with u4.2? I didn't know it sucked.
 

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Shorty's Performance
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8,860 Posts
Well i put 91 cause that's the highest the pump here in cali offer other wise i would put higher octane and besides all that i dont have any work done to the motor.
 

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Ex Postwhore
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4,688 Posts
I use 93 octane all the time, and when sunoco still offered it I used 94 octane.
 

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Discussion Starter #9
I heard the samething Ruthless about the U4.2. They was talking about in a zx14 fourm and they was saying the u4.2 hurt there times compared to the u4
 

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inappropriate
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Damn son why you being so cheap?:lol:
its what all the cool kids at school are doing...i clean my engine out w seafoam every 1000 miles. besides, members say they get better times on it and more power. my engine doesnt knock anyway.
 

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I only use Sunoco 92+ on crews. At the track 116
 

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u4 and mr9 are both 87 octane btw. and you will actually lose power using 116 :crackup:
yea I know what your saying. on my old yzf600 I lost +3peak HP when using it. Sad ah :badteeth:
 
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