1997 yamaha pro 50 2 cycle power loss

F

finreaper222

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Jan 7, 2011
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I have a 1997 50 hp. yamaha, it runs and idels good for the first 10 min and then it looses power and will only do about 2800 RPM. I had the carbs rebuilt but it still will only pull 26/2800 RPM, it always starts and idels good. any ideas?:confused:
 
9

99yam40

Fleet Admiral
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Sep 7, 2008
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8,874
Re: 1997 yamaha pro 50 2 cycle power loss

Have you tested the alarm system lately to see if it is functioning properly?
Sound like a over heat or oil level problem but the buzzer is not going off
 
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jeffersondodson561

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Oct 28, 2010
Messages
923
Re: 1997 yamaha pro 50 2 cycle power loss

Spark test, if I remember correctly, does this engine have a crank position sensor that controls one cylinder? I would check for spark on all cylinders first.
 
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99yam40

Fleet Admiral
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Sep 7, 2008
Messages
8,874
Re: 1997 yamaha pro 50 2 cycle power loss

nope no CPS on those motors.
It is always a good idea to first check compression and spark when working on a motor.
Especially if you have been running it while it has a problem.

But you must always make sure the alarm system is functioning properly.
If it is going into the safe mode because of over temp or low oil level the timing will be retarded and you can see that with a timing light
 
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