1991 Johnson Fastrike 150hp yesterday overheated motor. Alarm went off i shut it down it smelled awful and was smoking and hot to the touch .Let it cool down after trying to clear the screens on the pick-ups and then after about 7hrs it sarted but the alarm is still on . I tried backflushing it and then tried to run it on muffs but alarm will not shut off?? What do you think do I need to replace impellar