Yamaha F40 bogging issues

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Yamaha F40 bogging issues
Yamaha F40 bogging issues
Yamaha F40 bogging issues
December 15, 2017 6:20 pm EST
Location: 33.436N 77.743W
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Yamaha F40 bogging issues
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Yamaha F40 bogging issues
 
 
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Ranger2300
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PostPosted: Tue Aug 08, 2017 11:40 am    Post subject: Yamaha F40 bogging issues Reply with quote

I have an issue with my 2002 Yamaha F40. I have had this motor for three years and it has performed well with no issues. I had the motor services including a carb cleaning when I bought the boat because i didn't know much about the boats prior maintenance.

It will crank and idle great but it will bog down as power is applied. I have cleaned the carbs and changed the fuel line and primer bulb from the tank to the motor. I have watched the internal (under the cowling) fuel lines to see if they are collapsing as the throttle is applied, and they look fine.
When its starts to bog down you can push in the key to activate the electric choke and it will come up to speed.

I have pulled the plug wires one at a time to make sure I do not have a dead cylinder.

I have also read that you can replace the jets in the carbs with the jets from a F25 because they are larger. I know that Yamaha designed the jets for a reason and do not want to cause any damage to the motor, however is this something that is a possible solution?

Any suggestions or advice would be appreciated.
  
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BarryTurano
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Joined: Sep 21, 2009
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Location: Wilmington NC

PostPosted: Tue Aug 08, 2017 12:22 pm    Post subject: Reply with quote

Are you running on a portable tank? If not do you have a fuel water separator in the fuel tank line? It may be bad fuel.
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Ranger2300
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PostPosted: Tue Aug 08, 2017 9:12 pm    Post subject: Reply with quote

I forgot to mention that before I cleaned the carbs I emptied the fuel tank and started with fresh fuel.  
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seapro180
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PostPosted: Tue Aug 08, 2017 10:40 pm    Post subject: Reply with quote

Good luck!! I have a yami 115 on my 180cc. It started doing that a couple years ago. Still does it to this day!!! Cranks fine, idles fine but loses power when put under load. A quick hit of the choke will get it going. Once it gets up and going after hitting the choke it will run like new all day long until i stop. Then i have to hit the choke again to push it past the bogging point to get going again. I have probaby bought enough new parts trying to figure it out that i could have just bought a new motor. Finally just gave up and deal with it no more than i use it.
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jasonafox
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PostPosted: Wed Aug 09, 2017 6:55 am    Post subject: Reply with quote

I'd put some SeaFoam in the tank, run it a bit so you get the SeaFoam in the carb good. You may be surprised. Sounds like gum in the carbs to me. It doesnt take long to build up, especially if you aren't running non-ethanol gas exclusively.  
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ncsportfisher
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PostPosted: Wed Aug 09, 2017 8:17 am    Post subject: Reply with quote

On my past carbed outboards.... when you have to hit the choke to keep it going it is a tell tale sign the high jet is clogged...  
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seayacharlie
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PostPosted: Wed Aug 09, 2017 10:41 am    Post subject: Reply with quote

One more thing I would like to bring to your attention is the cylinder that is running lean will run hot, and a good chance you will lose that cylinder if that jet is not removed and cleaned. I have a 150txra and it does not like ethanol to sit
in the carbs to long without use.
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Ranger2300
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PostPosted: Sun Aug 13, 2017 7:56 am    Post subject: Reply with quote

Thanks guys for the suggestions. Tried everything and still having the issue. I took it to the shop that I use to let the professionals work on it. Ill let you know what they determine is causing the issue when I get it back. Luckily its my gigging boat and not my fishing boat so I not out of the game completely.  
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