Yamaha 15hp four stroke trolling speed

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Copperliner

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May 7, 2006
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Recently purchased a 2006 model Yamaha 15hp four stroke. Trolls a lot faster (> 1 mph)compared with our older 2-stroke Merc. Is there any way to slow the trolling speed down, without stalling the engine? I only see two adjustment screws, one holding a gold-colored rod that slides, and another screw on the upper left side with a spring on it. Any help is greatly appreciated! Mike
 
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rodbolt

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Sep 1, 2003
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20,066
Re: Yamaha 15hp four stroke trolling speed

idle speed in gear trolling is 850 RPM
 
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Copperliner

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May 7, 2006
Messages
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Re: Yamaha 15hp four stroke trolling speed

Thanks Rodbolt, I'll have to get the rpm's checked out at a service center. Trolls too fast for my liking and I really don't care to blindly tweak any carb adjustment screws to try and slow it down. I was hoping that it just needed more "break-in" time, but I really don't believe anything will magically change for the better. (Almost wish for my old two-stroke back!) Thanks again.
 
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rodbolt

Supreme Mariner
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Sep 1, 2003
Messages
20,066
Re: Yamaha 15hp four stroke trolling speed

they do idle a bit fast, they dont idle down much lower reliably. you may try a smaller prop.
 
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