overheating on ox66

[richardlaquis]

Can you suggest the possible causes of overheating on an ox66. The water indicator is very weak but the impella appears to be in good condition

[rodbolt17]

well we have narrowed it down to a V6 yamaha 2 stroke EFI.
really need a full model number and what conditions precipitate the alarm.
also what visual indicates are on the tach when the alarm sounds.

[richardlaquis]

The nengine is an L250TXRv
After reading some on the previous feedbacks I decided to clean the popit valve and the water indicator immediately started peeing properly
thank you got the help

[marinespec]

If you still get a high speed overheat, check for blocked heads