Hey I just started using octane 91 gas in my ninja 250ex, and it has no power at all, it won't get up to 45mph.

I actually ran completely out of gas, then refilled it with octane 91 gas, and now this is happening.

Halp?

 

Welcome to K.F.
Not sure. But you could check your fuel filter and Plugs.
Good Luck

 

and drain the bowls to look for sediment and water.
Welcome to KF