1985 yamaha 115 outboard wierd problem

1kkfan

Seaman Apprentice
Joined
Apr 5, 2010
Messages
43
hello I just bought a 1985 boat and motor. I replaced the four plugs, fuel pump and primer bulb just as a precaution. unloaded her and and started the motor. immediately the motor started running rough. it sounded like the thing was sneezing. it would run and then sneeze. i noticed it even blew off one of the vaccum lines. anyway i put her in gear and it would pick up speed a little but when i went to increase the speed it would bog down. i kept on moving the throttle back and forth then all of a sudden it took off like something was chasing it. awesome power. then when i back her down to neutral and try to go again it would do the same thing. I again played with the throttle back and forth slow to fast. it would bog down and then shoot off like a rocket again like nothing was wrong with it. I would appreciate any help with this.
 

Doh

Petty Officer 2nd Class
Joined
Aug 12, 2008
Messages
193
Re: 1985 yamaha 115 outboard wierd problem

It sounds like dirty carbs, partically in the Pilot Jet system.
 

1kkfan

Seaman Apprentice
Joined
Apr 5, 2010
Messages
43
Re: 1985 yamaha 115 outboard wierd problem

just rebuilt the top carb today and put a new carb on the bottom. how do you adjust the idle air/gas exactly. still sneezing
 
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