bombardier 1997

Hello, I just bought a 2 stroke bombardier and the other owner just put 91 in the tank but not mix up. I tried the jetski but when I put more speed the engine don’t want to put all the speed and go back to idle. I want to know if it’s the beacuse he don’t mix up or not. Thank you !

hello, I just bought a 1997 gs bombardier and when the back no longer touches the water, it wants to turn off. Also, when I want to accelerate to the maximum, it doesn't want to and tries to turn off too, I was wondering if this has already happened to you or do you know the problem? Thank you...