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Blown 331
05-03-2004, 02:37 PM
Hey what is the stock compression for a YFZ450? I heard it was 12 to 1 anyone know if that is right?

EvilJester400EX
05-03-2004, 03:25 PM
11:9:1

Blown 331
05-03-2004, 03:28 PM
Cool, thanks and how do they run on 93 octane with that much compression?

EvilJester400EX
05-03-2004, 09:01 PM
I have no idea, I personally run 106 in mine.

4TraxRider
05-03-2004, 09:38 PM
Me and my friends have no problem running 93 octane in ours. The sticker on the tank says to use at least 91.

EvilJester400EX
05-04-2004, 02:04 PM
I ran 93 in mine for the first 2 weeks, then switched to 110, then backed down to 106, seems like it liked the 106 best.