How high compression piston on pump gas?

[WesYfz450]

Does anyone have an idea of how high compression piston can be run in a 06 Yfz and still run pump gas? I want a little more pull off the bottom end for MX. I know wiseco make a 12.4:1 piston, is that to high for pump gas?

[yfzrider690]

12.5:1 is the cutoff for pump gas. I run a 12.5 and have no problems running supreme.

[yfzrider73]

Yeah you dont want to go any higher the 12:5. . . . If you go to 13:1 or higher then it is recommended that you run at least 100 octane or more depending on how high you go

[florentino]

Originally posted by WesYfz450
Does anyone have an idea of how high compression piston can be run in a 06 Yfz and still run pump gas? I want a little more pull off the bottom end for MX. I know wiseco make a 12.4:1 piston, is that to high for pump gas?
there is better ways to make hp. with simple mod you wont see a big gain.