over heating

[sb1129]

i have yamaha prov175 1994 runs great but when at about 3mph buzzer gose off. after 10-15 min tac indicate over heating when i shut it down for about 5min its fine. replaced impeller still same need help

 

[99yam40]

Re: over heating

check the PRV for being stuck open dumping too much water at low RPM