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Old 01-19-2013, 01:33 PM   #1
35xj OP
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Location: asheville, nc
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Stranded on the road, need help

Almost in Huntsville, al

04 950. 34 k on it. Faccet do. Recent valve check.
Bike is behaving like its running out of fuel sporadically
Doesn't sputter or die, but stutters and looses power
Idles fine, runs well at low speed, won't run well above 50
Continuously.
Bypassed fp made no difference.

N
Red some help on what is wrong

Help please!
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Old 01-19-2013, 02:01 PM   #2
Dru
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Check the fuel filter for clogging? Vapour lock?
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Old 01-19-2013, 02:21 PM   #3
Dusty
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Vent lines for the carbs?
If the canisterectomy was done the 2 bowl vents need to be through the bottom of the air box between the cylinders. Out of turbulent air.
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Old 01-19-2013, 03:07 PM   #4
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+1 I did the valves on mine and left the vent hose out to open air and same symptoms, rerouted the vent hose back between the cylinders fixed it.




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Vent lines for the carbs?
If the canisterectomy was done the 2 bowl vents need to be through the bottom of the air box between the cylinders. Out of turbulent air.
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Old 01-19-2013, 03:50 PM   #5
jclark83
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Could be a split carb diaphragm.
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Old 01-19-2013, 04:16 PM   #6
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Hows the air filter? Happened to me once on my zx9r, I put too much oil on the K&N filter. Ran fine on the bottem end but was terrible on the top end. The shop that I took it to had a real good laugh.
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Old 01-19-2013, 06:42 PM   #7
35xj OP
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air filter is good, vent hoses are kinda in the area of air flow. ill move them tomorow.

tell me more about the split carb diaphram?
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Old 01-19-2013, 06:55 PM   #8
Katoom119
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It has to be some kind of vacuum lock. The fp can't pump enough fuel to the carbs against a suction. When you put it back together you may have pinched a vent hose.
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Old 01-19-2013, 07:16 PM   #9
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plan to tear into it tonmorow morning. the problem is strangely sporadic, the bike will run well for a while, although generally feels down on power, kinda feels like a miss possibly?

plan tomorow is to take it back apart, pull the carbs and look it iver. check carb boots, plugs,coils, etc

bike is also running a higher than normal idle (2K) or so, lots of popping backfiring. Temps are fine, no obvious leaks etc
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Old 01-19-2013, 07:29 PM   #10
jclark83
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Carb diaphragm

The throttle cables open the butterflies on the carbs. The black slides that carry the needles are operated by vacuum via the diaphragms. They are located under the black covers on the ends of the carbs. With age they develop cracks that cause a vacuum leak, causing the black slide to not fully open. If your problem didn't start immediately after service work this is where I would look. I had a similar issue and found one of mine split. If you have a split diaphragm I would replace both of them. Good luck and keep us posted on what you find out.
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Old 01-19-2013, 07:48 PM   #11
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the problem did start within 100 miles of service, leads me to hope/believe its something stupid i did.

Its wierd, because the problem has become much more prevalent as the day has gone on. the bike is now running high idle and popping like crazy.
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Old 01-19-2013, 08:04 PM   #12
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Maybe you didn't get your carbs fully seated in the boots and one of them has come out of the boot? High idle and popping points to a vacuum leak or fuel supply problem.
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Old 01-19-2013, 08:21 PM   #13
Katoom119
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Quote:
Originally Posted by jclark83 View Post
maybe you didn't get your carbs fully seated in the boots and one of them has come out of the boot? High idle and popping points to a vacuum leak or fuel supply problem.
+1
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Old 01-19-2013, 08:48 PM   #14
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Quote:
Originally Posted by 35xj View Post
plan to tear into it tonmorow morning. the problem is strangely sporadic, the bike will run well for a while, although generally feels down on power, kinda feels like a miss possibly?

plan tomorow is to take it back apart, pull the carbs and look it iver. check carb boots, plugs,coils, etc

bike is also running a higher than normal idle (2K) or so, lots of popping backfiring. Temps are fine, no obvious leaks etc
Check carb boots, vent/vacuum lines. Sounds like something simple missed during service.
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Old 01-20-2013, 12:13 PM   #15
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Quote:
Originally Posted by jclark83 View Post
maybe you didn't get your carbs fully seated in the boots and one of them has come out of the boot? High idle and popping points to a vacuum leak or fuel supply problem.
+2
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