BONDGUY399
Parking Attendant
Posts: 25
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posted June 09, 2008 07:29 AM
 Edited By: BONDGUY399 on 9 Jun 2008 08:30
Stumble is getting worse, Help!
So, I'd love to get some help from you guys. I found someone else had the same problem over on 12r.org.
Basically, when it started, i had a stumble when taking off up until just under 3k, then it went away and smooth power till red line. Gas is good. Tried fuel injector cleaners. And tried cleaning fuel/air filters.
Then Saturday i washed my bike. Monday (today) i started it up and noticed it didn't idle up with the choke as high as normal. Normally goes to about 2.2k now it hit like 1.7k. When i left the stumble didn't go away at all, in any gear up to like 5k.
By the end of my ride to work, it was there up until about 4k and if i gave more than 1/3ish throttle it would stumble and accelerate poorly. But if i stayed up about 6k in 1st or second the stumble sometimes wasn't there.
I have NO freaking idea what could be causing this chaos. Idea's i've had tossed around are:
Plugs, ECU, Throttle bodies out of sync, TPS.
The original post is here:
http://www.zx-12r.org/phpBB2/viewtopic.php?t=52565
Edit: should also say its a 2000 12r with 6500 miles on it.
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2000 ZX-12r
  
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ninja12
Needs a job
Posts: 3310
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posted June 09, 2008 07:34 AM
Do you have a PC , if so disconnect it.
Try new plugs.
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BONDGUY399
Parking Attendant
Posts: 25
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posted June 09, 2008 07:42 AM
quote:
Do you have a PC , if so disconnect it.
Try new plugs.
haha, for some reason i thought you were calling me an idiot on that first line in a roundabout way. Then i realized you meant PowerCommander.
No PC, but you're the 2nd person to recommend plugs. Perhaps ill have to snag those. what brand/plug you guys recommend?
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2000 ZX-12r
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted June 09, 2008 10:13 AM
Have you had it apart to any degree recently? If so check all the vacuum lines and also the hose to the air pressure sensor.
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
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aliveagain
Needs a life
Posts: 5033
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posted June 09, 2008 12:26 PM
Have you checked for any codes?I'm wondering if it is running in safe mode.
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I wondered why the baseball kept getting bigger. Then it hit me.
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aliveagain
Needs a life
Posts: 5033
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posted June 09, 2008 01:29 PM
And also check your grounds and voltage on the battery.
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I wondered why the baseball kept getting bigger. Then it hit me.
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VincentHill
Needs a life
Posts: 6520
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posted June 09, 2008 01:57 PM
My thought is you "Washed" it and maybe got the Spark Plug Wells Filled up with water and are shorting out the Plug. No easy way to resolve this other than to go in there and dry out everything.
If you are careful, you can disconnect the Stick Coils and pull them out and then dry out everything and then see where you are. Not too much work and no money spent! Did you use a High Pressure Wash? Garden Hose? Water over the engine?
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Made History @ Daytona and still one fast old man!!
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BONDGUY399
Parking Attendant
Posts: 25
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posted June 09, 2008 02:17 PM
quote:
My thought is you "Washed" it and maybe got the Spark Plug Wells Filled up with water and are shorting out the Plug. No easy way to resolve this other than to go in there and dry out everything.
If you are careful, you can disconnect the Stick Coils and pull them out and then dry out everything and then see where you are. Not too much work and no money spent! Did you use a High Pressure Wash? Garden Hose? Water over the engine?
Well i was thinking something along the same lines. I'm picking up some new plugs tonight, so ill dry everything out at the same time, and pick up some electrical parts cleaner. I wash with a garden hose, but i just use the mist setting and use as little water as possible. avoiding spraying engine etc. But no matter how careful, sometimes shit just happens.
The bike hasn't been apart at all since i've owned it, and the previous owner (see him daily) never had the stumble at all. Did a visual looking for any loose hoses, all looks and sounds ok. Im going to gather all the parts for a nice shiny TB sync, and build one, and do that. Also need to look into doing the TPS.
Battery was dead when i got the bike, but one long ride and it hasn't so much as hesitated to turn over. Ill have to whip out the voltmeter and see what she says. this does however remind me of a random lead that could be grounding out....god i hope its that simple...
No codes that i know of. My light would come on correct?
Update tonight, thanks so much for the help guys.
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2000 ZX-12r
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countersteer
Needs a job
Didn't read the owners manual
Posts: 2207
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posted June 09, 2008 02:32 PM
check the 'reservoirs' in the ram air ducts. ive been caught in the rain before, and had a similar problem - the 'reservoirs' were almost completely filled with water and my 12 was bucking a little! just a thought.
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Scott
Long Island, New York
2006 ZX-14, 2003 ZX-12R
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aliveagain
Needs a life
Posts: 5033
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posted June 09, 2008 06:58 PM
quote:
quote:
My thought is you "Washed" it and maybe got the Spark Plug Wells Filled up with water and are shorting out the Plug. No easy way to resolve this other than to go in there and dry out everything.
If you are careful, you can disconnect the Stick Coils and pull them out and then dry out everything and then see where you are. Not too much work and no money spent! Did you use a High Pressure Wash? Garden Hose? Water over the engine?
Well i was thinking something along the same lines. I'm picking up some new plugs tonight, so ill dry everything out at the same time, and pick up some electrical parts cleaner. I wash with a garden hose, but i just use the mist setting and use as little water as possible. avoiding spraying engine etc. But no matter how careful, sometimes shit just happens.
The bike hasn't been apart at all since i've owned it, and the previous owner (see him daily) never had the stumble at all. Did a visual looking for any loose hoses, all looks and sounds ok. Im going to gather all the parts for a nice shiny TB sync, and build one, and do that. Also need to look into doing the TPS.
Battery was dead when i got the bike, but one long ride and it hasn't so much as hesitated to turn over. Ill have to whip out the voltmeter and see what she says. this does however remind me of a random lead that could be grounding out....god i hope its that simple...
No codes that i know of. My light would come on correct?
Update tonight, thanks so much for the help guys.
There is a connector fitting in the tail that you have to ground out.I just use a short piece of wire.If you're not sure ,do a search on the subject. The code with the fi light blinking in short and long durations. That is the self diagnostic code the ecu gives.
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I wondered why the baseball kept getting bigger. Then it hit me.
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted June 09, 2008 09:18 PM
Battery problem / possible alternator output is a clue. You must have a solid 13+ volts under load for clean running. If you can find a load tester check the battery under load.
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
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BONDGUY399
Parking Attendant
Posts: 25
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posted June 10, 2008 12:29 AM
quote:
Do you have a PC , if so disconnect it.
Try new plugs.
I should kiss this man.
2nd person to say it, so i finally did it.
$45 bucks on the iridium's and its all kosher.
I need to sync my TB's still, a bit jumpy at idle, but oh my. so so so much better.
thanks for all you're help guys.
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2000 ZX-12r
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psycho1122
Pro
Posts: 1608
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posted June 10, 2008 05:30 AM
If you have a full pipe on it, open the air screws 2 turns out and sync. it from there.
This will give you smoother off idle throttle response.
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You say PSYCHO like it's a BAD thing!!
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CrotchRocket
Moderator
Bracket Racing with Betsy
Posts: 8038
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posted June 10, 2008 06:19 AM
What pipe do you have on your 12???
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Jason Miller StreetBike Seminars
*****DragRacers do it better, because they dont cut Corners*****
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BONDGUY399
Parking Attendant
Posts: 25
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posted June 10, 2008 07:04 AM
quote:
What pipe do you have on your 12???
Stock 
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2000 ZX-12r
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VincentHill
Needs a life
Posts: 6520
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posted June 10, 2008 11:32 AM
quote:
Battery problem / possible alternator output is a clue. You must have a solid 13+ volts under load for clean running. If you can find a load tester check the battery under load.
No truer Words Spoken! My friend had a ZRX1100 than would spin over quickly but difficult to start and did not run perfectly. The one day I hooked the Volt meter to the battery and saw close to 13 volts. I kept it connected and when he hit the starter Button the voltage fell to between 8 to 11 volts which is not enough to operate the Bike.
On a ZX12R this is not the easiest thing in the world to do. I would suggest hooking up a red wire to the Positive side of the battery with a Covered Female Connector so that while in the bike you can hook a volt meter to the battery. Then Spin the engine and check the Battery!
A low voltage battery will first cause a Miss and then when you give it too much fuel it will blow out the Spark until you let off and then a weak spark provided it runs at all!
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Made History @ Daytona and still one fast old man!!
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