Evinrude 25 hp, 92 model

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Posted by Wulin Suo ( on August 11, 2005 at 14:00:58:

Here is the problem I am having: When the motor goes to high speed, it lasts only a few minutes and then drops to
low speed suddenly (the motor does not stop). I has no power if I try to bring the speed up immediately. I have to wait a few minutes before I can increase the speed again.

Here is what I know has happened to the motor before: I found did something silly and have been mixing gas/oil 25:1 instead of 50:1. After I changed the ratio, the same thing still happens. I also noticed once that something blocked the water from coming out of the little pipe and that has been corrected.

I have changed the plugs, the gas lines, rebuilt the carb, and they even changed the CD unit. Nothing has been solved beside spending hundres of dollars. Can someone give me some suggestions as to what might be wrong? Could it be the gas pump? Does this motor have a thermostat?

Any suggestions would be greatly appreciated. Thanks

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