Cooling water pressure
 

I would check it out.. You could have a thermostat stuck open, that
would not allow proper water pressure to build up. It's 2005 so I
would guess it's under warranty, I would head on back to a dealer and
have them check it out, you can not depend on the “stream” alone as an
indication everything is ok.. Yamaha's have a spring & plunger that
regulates the pressure in the head and I have them stuck, usually do to
corrosion.. Would not expect that in your situation though..


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