hello i have 77 american skier with 351w. when you have water hose connected to it without tstat it is running @ 180...too hot. when it is put in the water it pegs out within 2 minutes. i have changed the following parts raw water pick up impeller, checked the manifolds and the risers for obstruction, had the timing checked, carb. set,main water pump removed and impeller checked looked normal. removed and replaced all hoses with marine grade. so i am basicly clueless and am in desperatly in need of some more knowledgable help!
