Engine Serial Number: 1B809127
Year/Make/Model: 2011/Mercury/225 ProXS
Prop you are Running: Tempest Plus 25P
Current Maximum RPM: 6000
Idle and WOT Water Pressure Readings: Don't know
Smartcraft or Analog Instruments?: Smartcraft
When I start and idle the engine at the beginning of a the day, the smartcraft alarm sounds with a continuous beep and STBD HEAD OVERHEAT appears. The engine temp spikes (around 155, I believe). Once I get above idle, the temp drops and the alarm goes and warning stops. It doesn't happen again for the rest of the day. This has happened on the last several trips. I replaced the poppet valve and I'm confident that I seated it properly, but it did not resolve the issue.
Any advice on a possible cause would be appreciated.