well i was told by the guy that did the heads on all my 700s that 13:1 was the limit for 93 oct on usally a well designed head. usally we ran them at around 12:85 but every motor is different. nobody really nows that much about the 900 head but i hear it is a prety piss poor design. and personally i wouldnt reccommend 89 oct premium only for me.
Originally posted by mnmsnowbeast@Oct 9 2005, 05:09 PM I dont know if poo changed there head design from last year 05 or not,but we took .010 off my head last year and i ran it on reg. or 87 all year w/no problems.
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