Anyone having problems overheating with 90 degree water

90 degree water is probably not your problem....how long since you changed out water pump?

Impeller, thermostats, and/or poppet valve. Likely one or a combination. Only other cause would be an obstruction in water flow somewhere.

^^^^^ this

Never had a problem with something like that. Hope you get it figured out.

Had same problem, it was a water pump problem, 200 bucks

if it only does it when you are idling around you have sand and small rocks in the poppet valve and need to clean it if it does it running on plane water pump or t-stats

2 bills??

Takes 30-45 min and the kit is 75 bucks

You might ask in the Equipment Discussion forum.

More like an hour of labor. 120$ plus parts. He was correct at couple a bills.

Make sure the plastic screens on the Loweunit are not broke. This will cause em to overheat running.

Who doesn't replace the water pump themselves?!

Replace the water pump. Super easy. Takes 30 min on a merc, not sure on yamaha

On a 90 or 115 easy to replace yourself. On a 250 much more difficult if you don't have help. Sounds like water pump to me. Do you have a water pressure guage?

Pulling the prop helps on the bigger motors. I do a 200 solo, and it's not too bad.

What year and model engine? OX66? HPDI? Vmax? Had something similar happen to me after idling through a silted area, sucked a bunch of that into the water jacket and restricted the water flow.