115 Pro XS 4s operating temp

[ncbass]

I used to religiously watch my motor temp on my old 200 Pro XS and make sure it was at the proper temp before getting in the throttle. Is the 4 stroke as temp sensitive or more lenient? What would be the safe temp before opening her up? I have a vessel view module ordered that should be here this week....

Thanks...

[jethro1]

IMO it is important to warm up any motor before operating it at power. Looking at a Mercury four stroke 150 owner's manual it recommends letting the motor warm up for three minutes before using it. Might not hurt to wait a bit longer if the water is really cold, just to be on the side of caution.

[Skeeterbait]

As I interpret my shop manual, The thermostat is supposed to open at 115 to 125 degrees. Normal operational range is listed as 122 to 158 degrees. I have never seen mine over 142 degrees.

[EuropeanAM]

In general... I'd watch for 120 degrees before heading out.

While cold seizures are less common in 4-strokes, it is indeed important that the engine reach appropriate operating temperature.