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  1. S

    Poor Cooling year 2000 40 HP 2 stroke

    Its under performing because it does not move enough water to cool the motor unless the motor is operating at a high RPM. The flow of water seems very good when I have a hose attached to the pipe that goes to the powerhead. I connected a drill to the drive shaft and spun the pump and what...
  2. S

    Poor Cooling year 2000 40 HP 2 stroke

    The reason I am hesitant to pull off head cover and water jacket cover is that fear of snapping a bolt. I know the torque is pretty low on these head cover bolts but....
  3. S

    Poor Cooling year 2000 40 HP 2 stroke

    I agree. However, these pumps seems to be way under performing. The pressure coming from the lower unit seems insufficient by a large amount.
  4. S

    Poor Cooling year 2000 40 HP 2 stroke

    Just telling you that I know how to install an impeller.
  5. S

    Poor Cooling year 2000 40 HP 2 stroke

    I am looking for better performance not seeking the basic installation and I am well aware of the rotation direction of the water pump impeller. The only part that has been changed out on the water pump is the impeller. You are telling me that the yamaha impeller is of superior quality and...
  6. S

    Poor Cooling year 2000 40 HP 2 stroke

    I have owned this motor for several years and it seems to have always had a cooling problem. And the cooling problem seems to stem from poor water flow caused by low water pump head pressure (if that is an apt term in this space). I have a couple questions about the whole water pump/cooling...
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