11:1 Piston

[MADMAX]

Will 11:1 piston run on pump gas 91?

[400exredrider]

yes, it is the highest you can go

[2muchquad]

yes you can,thats not necessarily the limit you can go,thats a falacy,every engine is different.i run 13.5 to 1 in my yzf with 93 octane,almost a year and a half no problems.im also a ham fisted mx b rider,WFO.i dont trail ride the tracks..:D

[400exredrider]

yeah 450s are different,,, 400ex highest you wanna go on pump is 11:1

[frosti108]

i put 94 in my 11:1 cr quad just because its the best gas around here. the mixture is always better in the higher octane gas than in the lower octane gas. :)