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Old December 15th, 2008, 05:01 PM
OmniPo OmniPo is offline
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Location: Marco Island, FL
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Default Yamaha 4-Stroke 50 Bogging

Well, I've been troubleshooting/wrenching on this motor for the last few days.

Finally got it in the water and took her for a test run. I could not get the engine to rev past 2800 rpm. If I tried to give any more throttle at that point she just bogs-down and threatens to stall.

If you bring the throttle back to idle the motor quits almost instantly. The first time I tried to restart... she started right back up.

The second time I tried this little experiment I couldn't get her to start again and ended-up paddling home .

It sounds to me like a fuel issue, but the carburetors were just rebuilt last year. Any advice would be greatly appreciated (I hope I've provided enough information).
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Old December 15th, 2008, 06:52 PM
Silvertip Silvertip is offline
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Location: Midwest
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Default Re: Yamaha 4-Stroke 50 Bogging

Bad fuel pump, bad fuel, water in fuel, air leak in fuel line, one or more floats stuck, clogged jets, bad plugs, stuck anti-siphone valve (if there is one) are just a few things to check. You've not mentioned what you checked, what you found, and what you didn't check.
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Old December 15th, 2008, 07:03 PM
OmniPo OmniPo is offline
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Default Re: Yamaha 4-Stroke 50 Bogging

I have really only gotten as far as pumping any old fuel out of the tank and replacing w/ fresh fuel and a decarb additive. But, that's what I was trying to run it on in the beginning.

The fuel bulb seems to be working properly, it's not getting sucked-flat... etc.

I guess I will start with checking the plugs. Thanks.
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