I just picked up an Explorer Tri-Hull with a 50 hp Merc Blue Band 2 stroke. I'm guessing it's an early 80's. The main problem is I have no water coming from my peehole. I originally used muffs but I stuck the motor in water and still no water but I do get exhaust and I can blow through it and it seems to be clear. Do you think I might need a new impeller and does anyone no were I could find out the date. I have looked on many sites but can't find any Canadian #'s . Mine starts with a 7. Hope some pro's can help