1990 85 Yamaha overheating

[popeye]

thansk please help,,

new impeller, new thermo, pressure release valve ok, pisses water fine idel low speed great run hard for 5 min over heats, pull thermo cover no water to block, run for 30 seconds then water pumps liker crazy. put cover back on same thing.

any thoughts it has stumped me good cleaned with salt away, flushed .

I have been told there might be a washer gone bad under the power head, and the water tube, a defect of sorts on these Engines,

thanks.

[scott]

I had a simular problem brought to the shop they had to take the engine off there was something caught in the base restricting the water flow

[popeye]

thanks was it the washer between the pickup tube adn the power head??,, thanks you how much if you remember and did it fix it

thanks

1988 yamaha 150 overheating.....strange

I cleaned the heads and jacket, water risng to top of head and thermostat OK, poppet value OK. I have not inspected the water pump since water is flowing well. Other than the engine not getting enough oil (2-stroke) i have no friggen idea what is overheating. anyone have an idea?

[boats.net]

Alsway start with water pump on an overheat problem.