Vx 250 over heating

[mr heat]

I have 2 engines 1997 Yamaha Vx 250 and evrything is running fine until I accelerate and the boat reaches crusing speed I have the heating alarm that rings right away but no problem at low speed. Any ideas what could be the problem?

thank you very much!

[jb123]

have you replaced prv/ poppet ...ever ?

[99yam40]

Bad PRV usually sticks open dumps too much water and causes overheat at low speed. High speed overheat could be water pump, thermostats, or blockage in coolig passages. You need to find out which motor is having the problem. If you have not replaced these items lately now is the time

[mr heat]

Both gages are showing over heating so both engines are heating how could they have the same problem..?