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Old May 17th, 2019, 07:38 AM   #1
JADEN05
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2012 250R carb issue

I have a 2012 250r the bike was running fine from one day to another the carbs started flooding, I bought another carb installed it the bike started right up and it was running fine for a few days and now this carb started flooding. I got the carbs cleaned and still the same symptom. Any help would be mostly appreciated. thank you
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Old May 17th, 2019, 07:45 AM   #2
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the vacuum petcock is operational? only flowing when engine cranking or running?

Pro cleaned carbs? New float valves? Or a driveway/toothbrush job?
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Old May 17th, 2019, 07:56 AM   #3
JADEN05
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gas flows when bike is off, i though the floats would stop the gas from entering the carb?
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Old May 17th, 2019, 08:39 AM   #4
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gas flows when bike is off, i though the floats would stop the gas from entering the carb?
They should, but the petcock should also shut off the fuel supply when the engine is off. If the float valves are leaking, inspect the needles and seats for wear, and make sure the floats can move freely. It may be worth just getting a new pair of float needles and seats. They're usually cheap. Ducatiman can give you a good source if you'd like one.

Welcome to the board Jaden!
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Old May 17th, 2019, 06:30 PM   #5
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To be clear, the float needles are affordably replaceable, the seats, however, are not. They are pressed in by the Keihin factory. There are various methods used to clean them. Just a heads up...never use a drill or metal utensil in any attempt, permanent damage will most likely occur. Chemicals or ultrasonic being the wiser alternative.
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Old May 19th, 2019, 04:12 AM   #6
JADEN05
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My thing is two sets of carbs same symptom so I bought a new petcock should get it tomorrow as per the tracking I will keep you guys updated.
Thanks for all the help... this forum is awesome.......
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Old May 19th, 2019, 06:05 AM   #7
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My thing is two sets of carbs same symptom so I bought a new petcock should get it tomorrow as per the tracking I will keep you guys updated.
As you pointed out above, even if the petcock is stuck in the "on" position, the floats valves should stop the flow of gasoline if they're working properly.

When you say the carbs are flooding, do you mean the usual definition, meaning letting too much fuel into the engine so it runs way too rich, or won't run, or are you saying gasoline is coming out the overflow tubes?
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Old May 19th, 2019, 08:52 AM   #8
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If the petcock flows when engine off, it’s bad. Replace the simple known bad things first. Long term pressure on the floats from being asked to stop the fuel flow could have taken them out too, but start with the obvious known faulty part
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Old May 20th, 2019, 06:40 AM   #9
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As you pointed out above, even if the petcock is stuck in the "on" position, the floats valves should stop the flow of gasoline if they're working properly.

When you say the carbs are flooding, do you mean the usual definition, meaning letting too much fuel into the engine so it runs way too rich, or won't run, or are you saying gasoline is coming out the overflow tubes?
yes way too much fuel. i ordered a new petcock should be getting it today> i will update you guys later today.
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Old May 20th, 2019, 07:12 AM   #10
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quoting Triple Jim....

"meaning letting too much fuel into the engine so it runs way too rich, or won't run, or are you saying gasoline is coming out the overflow tubes?"......

.....or into and filling the crankcase?

Specific answer please?
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Old May 20th, 2019, 07:32 AM   #11
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quoting Triple Jim....

"meaning letting too much fuel into the engine so it runs way too rich, or won't run, or are you saying gasoline is coming out the overflow tubes?"......

.....or into and filling the crankcase?

Specific answer please?
yes fuel was coming out the over flow tube.
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Old May 20th, 2019, 07:34 AM   #12
JADEN05
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Originally Posted by ducatiman View Post
quoting Triple Jim....

"meaning letting too much fuel into the engine so it runs way too rich, or won't run, or are you saying gasoline is coming out the overflow tubes?"......

.....or into and filling the crankcase?

Specific answer please?
i drained the oil yesterday and there was fuel in the gas as well.
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Old May 20th, 2019, 09:31 AM   #13
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That's the classic double problem: Petcock that doesn't shut off and leaking float valves.
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Old May 20th, 2019, 11:16 AM   #14
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In replacing float valves with new today in a members 250 set I encountered a defective float valve. In wet testing, in 1 carb a very high fuel level was present no matter how I adjusted the float. Change float valve, readjust...perfecto.
The other carb with new float valve was fine.

Rare, but it happens. I can see some minor defect (a weird ripple) in the viton tip surface, though not readily apparent unless closely inspected.

Oh well, 1 defective float valve in the garbage....NEXT! And this is why we wet test...reveals error PRIOR to carb install on motorbike, saving yet ANOTHER R & R.

Another post shall follow in the thread entitled "the Amazing Carb Adventures Of Ninjette". Hey, not a bad idea...what you think @Triple Jim ?
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Old May 20th, 2019, 11:24 AM   #15
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to go back to topic....agreed OP @JADEN05 needs to renew his float valves (as well as the petcock he's waiting on). Setting, checking both float and fuel levels within the float service phase.
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Old May 21st, 2019, 06:22 AM   #16
JADEN05
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to go back to topic....agreed OP @JADEN05 needs to renew his float valves (as well as the petcock he's waiting on). Setting, checking both float and fuel levels within the float service phase.
so petcock was replaced, bike started right up idles great. when I took the bike for a spin at low rpm the bike bogs out a little from 2500 to 4500 rpm then clears up and runs strong. today I will change my spark plugs hoping this will clear up the rpm issue......
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