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Have you checked the engines temperature manually with an IR temp gun at the cylinder head to see if it is actually overheating?
If anything it sounds like is just a faulty temp sensor activating before it should if you are at 148 degrees. It really shouldn't go off until the engine hits 190F. What you want to do is disconnect it and run it, and see if the alarm still sounds. If it stops, then it is just a faulty temp sensor. Does that make sense?
. The readings in the 140s were running with the cups on it at 1200 and 2200 rpms.
Ahhh okay. What you want to do next is pull the cover, run the engine on the water until the alarm goes off. Immediately shut if off and then take the temps again. Is that something you can do?
Sounds good, let me know how you make out.
A clogged/scaled up water jacket can definitely do it. There is also a grommet at the top of the water tube seal and if that goes bad it will draw air bubbles into the powerhead at higher speeds. If this was brought to me what I would be doing is removing the lower unit and double checking the pump installation. If that looks good I would pull the thermostat out, hold a garden hose against the water tube and see if water flows freely through the block. If it does not, I pull the cylinder head and look for signs of any kind of clogging. If it does, I pull the powerhead and inspect the top of the water tube grommet. Does that make sense?