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Old 04-08-2019, 12:17   #31
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Re: Yamaha 15 two stroke running on one cylinder

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Originally Posted by keepondancin View Post
Saw the post. My concern would be water intrusion, not just from condensation, but also leaving it open in the rain, or tied down in the dinghy and a heavy rain rain filling the dinghy. I didn't remember to open the tank, I probably wouldn't remember to close the vent.
Then you should keep the new tank. With the old style tanks you also have to remember to open/close the vent
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Old 09-08-2019, 14:14   #32
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Re: Yamaha 15 two stroke running on one cylinder

I have the same exact Yamaha 15 hp 2 stroke and my bottom cylinder was not firing. It was due to a blocked lower cylinder exhaust nipple/hose and the cylinder ran great after I disconnected the hose and blew carb cleaner and air through it both ways.
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Old 09-08-2019, 14:39   #33
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Re: Yamaha 15 two stroke running on one cylinder

I had that problem on my Yamaha 15 hp two-stroke it was the fuel promise diaphragm had a small pinhole and that causes the bottom cal to flood. New fuel pump diaphragm solve the problem
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Old 09-08-2019, 14:48   #34
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Re: Yamaha 15 two stroke running on one cylinder

Damn auto correct! Pump not promise
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