Engine temp range?

[pro350hydro]

Okay so you can't drill and tap the head. But you could put it in the water outlet tube as close to the block as possible right? Like with a t fitting...

[Andrew 4CE]

Thanks for the Yamaha number.

CHT vs water... CHT sounded a lot easier to move from motor to motor.

Is water temp a better method if doable? This computer has fittings for both.

I did find out that the only thing they need the temp range for is to set the user configurable over heat indicator light. The unit itself reads to 499 F

[bh/]

I wonder about the variance in these numbers, and are we reading in C or F ?
One reference I have [Dixon, 2005] reports values for air cooled heads, which should be higher than water cooled;

LOW; 160C, 320F
MED; 180C, 355F
VHigh; 220C, 430F

Snyder's value at 390-420F seems to agree with this,
The Yamaha 50 at 240(?) sounds odd???

The design of a water cooled head, depth of plug etc could drastically affect reported values. An air cooled head may read more consistently, motor to motor.
But in tuning a specific motor, ie; setting mixture and advance, relative values are what is important , not what the other guy gets, or says he gets