Im looking at a 1997 seadoo challenger for sale with the single 110hp 787 engine , they are asking $2400 , the guy just replaced the impeller and shaft. He says it runs but it will only do about 15mph, he says it needs carb work and a valve cover gasket. It also needs a new fuse block that powers the lights , bilge and blower. I have no idea why it would only reach 15mph? low compression??? The boat seems to be in very good cosmetic shape. Im just wondering if it would be worth it to buy it or will it be a headache of problems.