I have a 1996 90hp Yamaha and having alarm problem. When i first got it i couldn't take it over 3000rpm without the heat alarm sounding. So i took it to the shop the thermostat was bad and the water pump blew apart. So i got them replaced. It fixed the problem sort of! I could run between 35 to 3800 rpm and then the same problem. Alarm comes on and kick the motor into safety mode. So i took it to my uncle (who is a mechanic) he took it apart and cleaned it. It was pretty gumed up. So yesterday i put it in the water i got to 4000 no problem. But at 5 grand problem started again. I was told that this moter should operate in the 5500 range but i cant find Yamaha recommendations on it. Is there something i am not doing or am i running to high of rpms. This problem is going for a year and is starting to get tiring.