2005 Yamaha power loss

[jbjunior66]

My problem is that my engine shuts off while i"m attempting to land my boat. I thought that maybe it was because I was throttling up in shallow water, but that don't make since to me because it is possible to start the motor out of the water. I'm at a loss. It's a 2005 yamaha 50hp 2 stroke. During my last service I informed them of the problem and they said they didn't see anything wrong with the motor. I have about 41 hour on the motor and other than this problem it runs fine. Any ideas or commits will be helpful.

 

[rodbolt]

Re: 2005 Yamaha power loss

need a bit more information.<br /> when you say it shuts off does it quit? cough and quit or slow down and die? how high are you trimming it when attempting to throttle up? <br /> if trimmed to high the fuel bowls get low on fuel as all the remaining gas in the bowl moves to the front keeping the needle valve shut.<br /> has it always done this? do you have a good fuel water seperator installed?

 

[jbjunior66]

Re: 2005 Yamaha power loss

Yes Rod it does quit instantly with no cough or slow down. I trim it up just enought to clear the bottom. It does happens 90% of the time. I do have a fuel seperator and i will check that in the morning. And for more info it will idle while i am trimed up,put as soon as i put it in gear it will quit. Thanks for your input.

 

[rodbolt]

Re: 2005 Yamaha power loss

could be the floats are misajusted or the mixture screws on the carbs need a bit of tweaking. try turning them ccw 1/8 of a turn a time or two and see if that helps.

 

[flatsfisher57]

Re: 2005 Yamaha power loss

I think he has caps over the mixture screws preventing him from turning the screw,did the dealer sync and lync the carbs for you when it was in their

 

[jbjunior66]

Re: 2005 Yamaha power loss

Flats, I don't really know what they checked. I'm taking the boat out tomorrow. I plan on checking out the ideas that you guys have passed along. If I don't have any luck, I'm going to take it back to them for more work. I'm still in my two year free service window. I have not looked at the carbs. as of yet. And really I don't want to make any adjustment without a manual close by. Again Thanks