Reply To: What is the proper temp of head on a 3hp JW-10 ?

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July 19, 2025 at 11:43 am #298298
David Stanton
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    The JWs don’t have a thermostat, so the temp it comes up to will change with the temp of the water it’s running in.  150 sounds OK.  If you are running in a small bucket, the water temp in the bucket can slowly increase too as the motor runs.   I flick water on the starboard side and/or top of the cylinders and if it doesn’t boil and spit, it’s not overheating.

    Dave