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Old 09-24-2007, 09:34 AM   #1
bigjay77
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carb issues???

2001 R6,

ok yesterday i spent alotta time in the upper rpm ranges while riding,
toward the end of my ride around 10-12rpm engine power took a nose dive and it was on and off power, it would pull steady/hard up till 10ish then sit there for a while and surge passed with jerky feeling, i didnt see any smoke or any different noise from the valve train, i still rode home!?!? when i checked the usual things, air filter dirty, fuel filter??, plugs could use a change, loose ingition wire #2 piston (need to be pulled way out for piston not to fire), and finally #1 carb appears to be spewing fuel into the airbox as it was wet when i pulled the cover off

my queston is am i missing any other potential problem, i will be puling the carbs this week and checking them
manual says weak power in high rpm = dirty/loose/clogged main jet, torn diaphram

your input is welcomed
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Old 09-24-2007, 10:07 AM   #2
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Your loose plug wires will cause this, as will other issues. Maybe a torn diaphram, and it's easy to check that. Did you test it out after you fixed your plug wire issue?
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Old 09-24-2007, 10:28 AM   #3
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yes i zip tied the wire and ran it up to those rpms but still power loss ill run it again at lunch to comfirm
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Old 09-24-2007, 12:31 PM   #4
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ok i just let her warm up and gave her 3 good WOT attempts and the problem wouldnt repeat, it didnt miss a beat

wth is going on????
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Old 09-24-2007, 12:58 PM   #5
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Check your number one plug, it could be fouling. That will cause it to spit unburned fuel back.
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Old 09-24-2007, 03:27 PM   #6
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Could be a timing issue if it's spitting that much fuel back. Likely though, the reason you're not duplicating the problem is that you fixed it by taking care of the wires and bad connections.

Run it a while and see what happens, check your plugs again after a bit (like 100 miles or so) to see if they look different.
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Old 09-28-2007, 02:15 PM   #7
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You likely have trash in the needle/seat on the #1 carb, thats causing the fuel to overflow through the bowl and into the carb throat...At that point it could go either direction, into the motor or up into the airbox...not likely though as those are downdraft carbs so its likely the engine is spitting it back out.....

Pull the carbs, go through them well, CHECK THE FLOAT LEVELS, check the diaphragms etc....Then install new plugs. That should fix you up...


Yes a clogged main jet will cause high rpm issues but with fuel spitting all over the place, you have other issues in the carbs.... Also sync them well after its running again...

I wouldn't run it anymore until you fix the carbs, you can wash the rings out of that cylinder easy with fuel flooding....then you will have bigger problems.
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Old 09-28-2007, 02:17 PM   #8
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FUKK I just reread and you said its fine now....its possible the trash blew out of the carb needle and the float closed the needle off again....I would still pull them, clean/inspect them, reinstall and synch...New plugs to....

Do it right bro....it will thank later for it.
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