compression?

[J.Brown121]

what's the highest compression you can have and still run 91 octane gas?

[CSR400EX]

it would be helpful if we knew what kind of bike you are talking about:blah:

[J.Brown121]

400ex. i'm thinking about rebuilding the motor, and i don't really want to run race gas b/c it's so expensive

[quadrider00]

11:1 will still run on pump gas any higher and you will probly have to mix race and premium pump

[J.Brown121]

thanks man. that's all i needed