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Everything Dirt Bike
General Dirt Bike
What octane to run?
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<blockquote data-quote="AKmotorider" data-source="post: 141983" data-attributes="member: 1118"><p>I have a 07 YZ250F with Stage 1 Hotcams, Wiseco 13.5:1 high-comp piston, and FMF full factory 4.1 exhaust with powerbomb. I doubt the exhaust has anything to do with octane, but anyway, I can get either Sunoco 110 or Sunoco 112. VP has some nice fuels but they are outrageously expensive. For the Sunoco, it's 11.75 per gal for the 110 and 13.75 for the 112. Whats the best for the cams and piston? The guy I talked to told me 112 for sure, since 110 only tolerates up to 13:1 (even though it can tolerate higher comp in smaller bores, it would still be pushing it). I think the MON is 106 for 110 and 109 for 112. Yet, I've also heard 112 is overkill...for some unexplained reason. Can someone enlighten me?</p></blockquote><p></p>
[QUOTE="AKmotorider, post: 141983, member: 1118"] I have a 07 YZ250F with Stage 1 Hotcams, Wiseco 13.5:1 high-comp piston, and FMF full factory 4.1 exhaust with powerbomb. I doubt the exhaust has anything to do with octane, but anyway, I can get either Sunoco 110 or Sunoco 112. VP has some nice fuels but they are outrageously expensive. For the Sunoco, it's 11.75 per gal for the 110 and 13.75 for the 112. Whats the best for the cams and piston? The guy I talked to told me 112 for sure, since 110 only tolerates up to 13:1 (even though it can tolerate higher comp in smaller bores, it would still be pushing it). I think the MON is 106 for 110 and 109 for 112. Yet, I've also heard 112 is overkill...for some unexplained reason. Can someone enlighten me? [/QUOTE]
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What octane to run?
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