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Thank-you for the responses. I changed the impeller and impeller ring 2 years ago. Do you think I need to change them again. It didn't help make it faster when I changed them the first time. Maybe something mechanical Thanks, Terry

I have a 1997 Sea Ray, Sea Rayder f16 Jet boat. It has a Mercruiser Sport jet 120XR 175 Hp engine. My question and problem is it only goes 37 mph. Does anyone know if this is as fast as it goes, or is something wrong with my boat. 37 mph seems awfully slow for a 120XR Any help would be...