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Old 04-12-2006, 04:03 PM   #1
ktm frank OP
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carb flooding

recently my bike is hard to start when its warm,i opened the air filter and there was fuel coming out of the needle dripping on the throttle plate
not much but enough to make the beast hard to start,got to twist it all the way every time,is anyone evr experience the same problem!!!!!
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Old 04-12-2006, 05:53 PM   #2
HellsAlien
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Oh yeah, has happened to me but worse (passed enuff gas to cause hydraulic lock in front cyinder!).
Most likely cause is full tanks or near-full tanks of gas. The gas heats up, expands, floods the famous carbon cannister. Also a vacuum-operated vent valve is closed with engine off that prevents carb bowls from draining (see fuel/emissions system diagram). Others may have more detailed info, but this is basic story.
Check that all tank vent lines are clear, not pinched to frame.
Read up on cannisterectomy threads, decide if you want to do that.
Bike probably won't run right until all fuel boils from cannister, be careful not to ride in heavy traffic, you may have a stall when you need power (don't ask how I know!)
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Old 04-12-2006, 06:01 PM   #3
posole vato
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Question I think i have carb problems to

yo franky!

i think i have some sort of carb problem myself...this is the deal...i have two month old 950 with only 300 miles....and it is shutting off at idle (At normal operating temperature) or when i twist the throttle to get started.....also when it was brand new it start immeadiately know.... it takes more than a dozen cranks for it to turn over....

i didnt take it apart to find out what the deal is....however i am dropping it off at the ktm dealership.....
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Old 04-12-2006, 08:18 PM   #4
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The problem is that you have got some dirt in the fuel, and that the float valve is not closing properly because of this dirt. The fuel pump requires back pressure to stop pumping. So the fuel is under pressure and will fill the float bowl until it starts to drip through the main jet, and out of the needle area.

The solution is to clean the float valve, and to fit a good in-line paper filter like this one which is off a lawn mower that has a fuel pump. Allowed to continue you could indeed end up with hydraulic lock. Good Luck.

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Old 04-12-2006, 10:53 PM   #5
ktm frank OP
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Thumbs down thanks to you guys

I will try what you guys said to me, because it is very probable that the cause is related to the needle and i'll let you know if it cures the booboo
I thought that dirt might have gone through the carbs,whats bugging me is that i took them off to clean them and of course the erratic carb had some crap in it,i though the problem would be solved but it wasnt so i'm very confused,
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Old 04-12-2006, 11:03 PM   #6
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Quote:
Originally Posted by ktm frank
I will try what you guys said to me, because it is very probable that the cause is related to the needle and i'll let you know if it cures the booboo
I thought that dirt might have gone through the carbs,whats bugging me is that i took them off to clean them and of course the erratic carb had some crap in it,i though the problem would be solved but it wasnt so i'm very confused,
Might be worth draining your tank. This is where it is coming from. After you clean the carb, new dirt gets in. It is just asking for trouble not having a good fuel filter Mr KTM..... Get your act together

You may have damaged your float valve seal
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Old 04-12-2006, 11:19 PM   #7
ktm frank OP
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gas filter

forgot to say that i installed a gas filter exacly like yours and flushed the tanks also otherwise it will make no sense,and it still does the same thing.
i did not dismantle the long needle (the one with the diaphragm) sorry i dont know how to say that in english .i think i'm gonna have to right?
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Old 04-12-2006, 11:48 PM   #8
Orangetwin411
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Frank, they are speaking of the carb float. You need to remove the carb bowels and the float to clean that area. You will see a small float needle attached to the float. That stops the flow of gas into the bowel when the float is up ( the bowl is full of fuel). You can clean the area with carb cleaner and some very low psi air. Hope this makes sense. It's easy to see how it works once you take the bottom of the carbs off.
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Old 04-13-2006, 07:49 PM   #9
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I have had the same symptom when my vent tubes were pinched. In every case, all was fine after I carefully re-routed the tank vent tubes. I might suggest that you check this simple free fix first.
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Old 05-16-2008, 06:15 PM   #10
Tha Rick
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Howdy inmates. I am having issues with a fuel pump I installed in my 950 making too much pressure. Is there any fuel pressure regulators out there that are recommended by other inmates. The pressure is O.K. for roads, but when I go through whoops it floods the bike out. I got the info for the aftermarket fuel pump http://www.advrider.com/forums/showthread.php?t=137838, using the 03307 facet pump.

Sorry for the stupid question, but I've tried searching for fuel regulators with no results.

Thanks in advance.
Tha Rick
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Old 05-16-2008, 07:07 PM   #11
cpmodem
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Quote:
Originally Posted by Tha Rick
Howdy inmates. I am having issues with a fuel pump I installed in my 950 making too much pressure. Is there any fuel pressure regulators out there that are recommended by other inmates. The pressure is O.K. for roads, but when I go through whoops it floods the bike out. I got the info for the aftermarket fuel pump http://www.advrider.com/forums/showthread.php?t=137838, using the 03307 facet pump.

Sorry for the stupid question, but I've tried searching for fuel regulators with no results.

Thanks in advance.
Tha Rick
Humnn, I'm not familiar with the 03307 Facet pump. Do you have any specs on it?

12 VOLT FACET® CUBE FUEL PUMPS
PART #
MAX-MIN PSI
GPH
POSITIVE LEAD
NEGATIVE LEAD
FITTING SIZE
DRY LIFT
CHECK VALVE
POSITIVE SHUT-OFF
40104
4. - 1.5
25
N/A
.25 RING
1/8-27 INT
12
N
N
40105
4.5 - 3
30
N/A
.25 RING
1/8-27 INT
12
N
N
40106
7. - 4
32
N/A
.25 RING
1/8-27 INT
12
N
N
40107
10. - 7
38
N/A
.25 RING
1/8-27 INT
12
N
N
40108
6 - 4.5
32
.25 BLADE
.25 RING
3/8 FLARE
12
N
N
40109
7 - 4.0
32
N/A
.25 RING
3/8-18 INT
24
Y
N
40135
7 - 4.
32
PACKARD
.25 RING
1/8-27 INT
12
N
N
40136
7 - 4.
32
PACKARD
.25 RING
1/8-27 INT
12
N
N
40137
7 - 4.
32
PACKARD
.25 RING
3/8-18 INT
24
Y
N
40138
7 - 4.0
32
PACKARD
.25 RING
1/8-27 INT
24
Y
N
40139
4.5 - 2
23
PACKARD
.25 RING
1/8-27 INT
24
Y
N
40147
9 - 4.5
32
.25 BLADE
.25 RING
1/8-27 INT
24
Y
N
40148
4.5 - 2
24
.25 BLADE
.25 RING
1/8-27 INT
24
Y
N
40163
2.5 - 1.5
17
.25 BLADE
.25 RING
1/8-27 INT
24
Y
N
40166
39 -25
9
175 BULLET
..
1/8-27 INT
..
Y
N
40171
3.5 - 2
15
PACKARD
.25 RING
1/8-27 INT
12
Y
Y
40176
5 - 3.5
19
N/A
.25 RING
1/8-27 INT
36
Y
Y
40177
2. - 1
7
N/A
.25 RING
1/8-27 INT
24
Y
Y
40178
3.5 - 2
15
N/A
.25 RING
1/8-27 INT
36
Y
Y
40185
11.5 - 9
32
N/A
.25 RING
1/8-27 INT
36
Y
N
40189
5 - 3.5
15
AMP
.25 RING
1/8-27 INT
36
Y
Y
40217
3.5 - 2
15
.156 BULLET
.25 RING
1/8-27 INT
36
Y
Y
40229
6 - 4.5
32
PACKARD
..
1/8-27 INT
12
N
N
40231
11.5 - 9
25
PACKARD
.25 RING
1/8-27 INT
84
Y
Y
40232
10. - 7
34
PACKARD
..
1/8-27 INT
12
N
N
40241
3.5 - 2
15
.157 BULLET
.25 RING
FEMALE FLARE
36
Y
Y
40252
1.5 - 1
6.5
PACKARD
1/8-27 INT
24
Y
Y
40254
4 - 1.5
25
N/A
1/8-27 INT
24
Y
N
40257
11.5 - 9
25
N/A
1/8-27 INT
84
Y
Y
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DISCLAIMER: All observations made in this post are mine and based solely on my own anecdotal experiences, and may contain large doses of facetiousness. YMMV, of course. You are "on your own", and I take no responsibility if someone tries anything in this post and gets into trouble with the law, damages their person or property, or goes blind. Take everything you read or hear "anywhere" butt especially on the Web with a large dose of salt.

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Old 05-16-2008, 07:56 PM   #12
Gumbydave
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Quote:
Originally Posted by Tha Rick
Howdy inmates. I am having issues with a fuel pump I installed in my 950 making too much pressure. Is there any fuel pressure regulators out there that are recommended by other inmates. The pressure is O.K. for roads, but when I go through whoops it floods the bike out. I got the info for the aftermarket fuel pump http://www.advrider.com/forums/showthread.php?t=137838, using the 03307 facet pump.

Sorry for the stupid question, but I've tried searching for fuel regulators with no results.

Thanks in advance.
Tha Rick
speed shops for race cars have nice regulators ($100+)
e-bay has some too
pep boys has one too
be sure to get a low pressure one for carbs not EFI
one problem is that most cheep fuel pressure regulators only restrict flow, when the line fills up the pressure is back up to what the pump output is.
good regulators dump excess pressure back to the tank,
What you need is a pump with 3-4 psi max output
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Old 05-16-2008, 08:03 PM   #13
Tha Rick
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Thanks, I'll try it.
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Old 05-16-2008, 08:16 PM   #14
cpmodem
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OK, I guess you're not going to tell me, so ...

uk_mouse fitted a regulator to his 950 to solve an over pressure problem caused by the wrong Facet fuel pump. Here's his latest post on the subject:
http://www.advrider.com/forums/showp...3&postcount=35



There's a lot of OC chatter and pontification about regulators over on the huge "Another Dead Fuel Pump" thread starting with uk_mouse's post at Post #515

Enjoy ....
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DISCLAIMER: All observations made in this post are mine and based solely on my own anecdotal experiences, and may contain large doses of facetiousness. YMMV, of course. You are "on your own", and I take no responsibility if someone tries anything in this post and gets into trouble with the law, damages their person or property, or goes blind. Take everything you read or hear "anywhere" butt especially on the Web with a large dose of salt.


cpmodem screwed with this post 05-16-2008 at 08:37 PM Reason: Add link
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Old 05-19-2008, 03:06 AM   #15
uk_mouse
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Quote:
Originally Posted by Gumbydave
What you need is a pump with 3-4 psi max output
Based on my experiences with the reg in the picture above, I'd say 2psi is more than adequate. If the dial on the reg is accurate of course! :)
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