Yamaha 150 loses 200-300 RPM

bellboy2k

Recruit
Joined
Jun 13, 2004
Messages
4
I will be running at 3600 RPM and one of my engines loses 200-300 rpm and a few seconds later it goes back up to 3600. I have changed all gas filters and plugs. What else can I check?
 

Ray Neudecker

Lieutenant Commander
Joined
May 25, 2004
Messages
1,656
Re: Yamaha 150 loses 200-300 RPM

Any thing which has to do with fuel delivery, including fuel pumps and carbs (if a carb motor)would be the first place to go.
 

polar2300

Cadet
Joined
Jun 10, 2004
Messages
10
Re: Yamaha 150 loses 200-300 RPM

I get the same problem with YAM 115 4 strokes. No idea. I'm going to call yamaha b/c im under warranty and my engines are brand new. less than 40 hours
 

fernandina

Recruit
Joined
Jun 21, 2004
Messages
5
Re: Yamaha 150 loses 200-300 RPM

Originally posted by polar2300:<br /> I get the same problem with YAM 115 4 strokes. No idea. I'm going to call yamaha b/c im under warranty and my engines are brand new. less than 40 hours
 

fernandina

Recruit
Joined
Jun 21, 2004
Messages
5
Re: Yamaha 150 loses 200-300 RPM

i had a lot problems with injector on 2002 115 4 add fuel water seperator on new boat wach for fiber glass dust in gas tank
 
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