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Discussion Starter · #1 ·
Hey all.. Ive been ridin my buddies YFZ450 for awhile and he just know told me that he has a 13:1 high comp piston in this thing.. It also has the 478cc bore kit on it by atheena...

Now wouldnt u have to mix your gas half premium and half racing or full racing gas on that much compresion...

I know with the raptors 12.5:1 and over u have to mix your gas but idk if its different on a YFZ450

Ive been running 93octane in it and im no longer driving it for now untill I find out for sure.. Im not payin for his engine if i mess it up
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