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04-22-2019, 03:45 PM | #1 |
Not Yet Wild
Join Date: Apr 2019
Location: st. louis missouri
Posts: 3
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Yamaha G9a flooding
I have a Yamaha G9a that starts great in the dead of winter or in the heat of summer. I have had it for about 4 years and very happy with it. At the end of last summer, I noticed that after I use it for a bunch of consecutive starts and stops (even over long distances), on my next restart it appears to be flooded.
Once it does this, I need to let it sit for 2-3 minutes and then it will start right back up. The spark plug looks good. Any ideas? |
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04-22-2019, 03:51 PM | #2 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Yamaha G9a flooding
Probably needle valve in carburetor. It's about a $15 fix. Do not go buy one of the cheapo China carbs on the internet, fix the original one you have, it's far superior quality.
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04-23-2019, 07:25 AM | #3 |
Not Yet Wild
Join Date: Apr 2019
Location: st. louis missouri
Posts: 3
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Re: Yamaha G9a flooding
What do you think is going on inside that carb as related to my issue?
It seems odd that the unit runs fine initially, meaning if the needle valve was bad wouldn't it run poorly all the time. |
04-23-2019, 10:04 PM | #4 |
Admin
Join Date: Dec 2006
Location: TN
Posts: 101,826
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Re: Yamaha G9a flooding
I'd clean the entire fuel system starting with removing the bad designed fuel filter in the tank and installing an in line fuel filter, take apart the fuel pump and clean it with carb cleaner, pull bowl off the carb and clean everything out really good (carb cleaner), and then check your gas tank cap to make sure it's not vapor locking and is venting properly.
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04-24-2019, 08:20 AM | #5 | |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: Yamaha G9a flooding
Quote:
All it takes is one little piece of dirt or debris, then the needle can't fully close/seat all the way, which will allow is as much fuel as the pump can move to flow through the carb, up and out. I would also replace the fuel lines with new ones. Over time they can deteriorate and the rubber inside the lines will flow into the carb and can create problems as well. |
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04-24-2019, 08:30 AM | #6 | |
Admin
Join Date: Dec 2006
Location: TN
Posts: 101,826
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Re: Yamaha G9a flooding
Quote:
Also make sure the little vent hose running to the back of the engine is good. |
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04-29-2019, 12:40 PM | #7 |
Not Yet Wild
Join Date: Apr 2019
Location: st. louis missouri
Posts: 3
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Re: Yamaha G9a flooding
Do you recommend a Yamaha parts supplier?
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04-29-2019, 12:53 PM | #8 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: Yamaha G9a flooding
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