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We have a 93 polaris Trail Boss 350 4X4 liquid-cooled. It has a speedometer and my brother had it about 57mph. He said he thought it had more but didn't want to find out with this big machine.
My step dad has a 1992 350L 4x4 2 stroke, its the same thing as the Trail Boss 4x4. If I remember correctly it will do about 60mph or so. I have not rode it in a real long time, so I am not positive.