Loss of Power...2 stroke 40hp Yamaha outboard

balboabob

Cadet
Joined
Aug 18, 2016
Messages
10
This 1985 outboard has been great. ran it today for 1.5 hours. Ran perfectly until I started loosing power. went from 25mph to 10mph at full throttle. Got me back to the dock running smooth but with about 1/3 the power. Any ideas of where to start?
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
8,874
does this motor have oil injection?
or an alarm system?
does the alarm buzzer work?
 

balboabob

Cadet
Joined
Aug 18, 2016
Messages
10
Yes it has oil injection. I have 3 lights on the motor, once the oil got low and a light came on. I have never heard an alarm or buzzer.
 
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