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Discussion Starter · #1 ·
Good morning gents , I am working on a zx12r for a buddy. He said it ran great, then the fuel pump went out and he parked it. I recently put a fuel pump and filter in it, as well as. Cleaned the gas tank out . It had a hard time starting at first , but once it got its injectors cleared , it runs good . Except it won’t stay running at idle once warmed up. Even with the fast idle lever on . I’ve tried adjusting the idle stop screw and it’s the same issue. You can take it out and ride it, but once you clutch in at a stop, it dies .
 

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Discussion Starter · #5 ·
Is the FI light on ?

cmg
No fi light . Oddly enough, I started it yesterday and it idled fine . I was able take it out for a ride around the block and it stalled once on clutch pull in. Maybe the aggressive fuel system cleaner I put in is finally dissolving stuff .
 

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You don't say which model it is.
If it's stalling out when you pull the clutch lever in then check the clutch switch, it's probably dirty inside and making poor contacts.
 
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i would inspect the vac lines and map sensor.
 

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I'll throw this out just in case as it has snagged more than a couple guys. Now bear with me because I am going back a long time.

There are two connectors on the ZX-12R that are identical. I want to say one of them is the TPS sensor but they are in the same locale on the bike and easy to mix up if you don't mark the wiring when you pull stuff off. If you mix the two up it will cause you a world of hurt. Just keep this in mid if you get stumped. I am sure there are some old posts out here on this but I don't feel like searching tonight.

The bike will run, but run like shit.
 

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Discussion Starter · #10 ·
Ok, finally back to this project . I do have this line that Is broke off . Best I can tell, it just vents to this rectangular cup ? Am I wrong ?
I do find an open line from the air box . It looks like it had a clamp on it at one time . Doesn't seem to meet anything tho. Any ideas? I'll check the map out . Is there a test procedure based on vacuum ?
Thanks
 

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Discussion Starter · #11 ·
You don't say which model it is.
If it's stalling out when you pull the clutch lever in then check the clutch switch, it's probably dirty inside and making poor contacts.
it will stall idling in the drive way. Shouldn't the clutch circuit be out of the equation in all situations except starting ?
 

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The first picture, that's just the fuel tank overfill spillage drain, It is normally about an inch long with a 90' bend in it, and slides down into a slightly covered drain point on the back of the frame.
The second picture says it's an A1.
It's more likely to be what Scott says, but, if you have a multimeter I would still check the resistance through the clutch switch and also the kill switch.
If the ECU thinks the bike is in gear with the side stand down because it can't see a good earth through the clutch switch it will kill the engine.
If the kill switch has dirty contacts then when the coils fire you will loose most of the voltage for the stick coil giving a weak or no spark.
These two things will not give a Fi light.
 
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