Wont idle consistantly - ZX6R Forum
 
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post #1 of 5 Old 10-16-2011, 05:31 PM Thread Starter
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I Ride: 2003 ZX6R
Wont idle consistantly

When I start the bike it idles really low. I choke it untill about 104-114 then when I turn off the choke it goes back to barely idling. I have to adjust the idle to get it to stay at 1200. When im riding it seems to go up and down a little. I can twist the throttle forward from 0% and it get low as well. I think I can adjust that out. But the starting idle I have to do every time. The screw dosnt seem to back off when I ride and I know it dosnt when its sleeping. Why would this happen..

Bike-2003 zx6r- yoshi rsc 3 can no kleen air mod k&n and pc 3.
27000 miles. Im sure its in need of a tune, valve adjustment and throttle body sync. I need to check the vac lines as well but anybody kn ow of anything that might be doing this im not thinking of?
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post #2 of 5 Old 10-16-2011, 10:05 PM
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after you adjust the idle screw at temperature do you mess around with it after? I set mine and have never had to touch it again after that point.

Also it may seem like a basic thing, but check your throttle cable and see if it's sticking anywhere
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post #3 of 5 Old 10-16-2011, 10:20 PM Thread Starter
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Quote:
Originally Posted by tlax04 View Post
after you adjust the idle screw at temperature do you mess around with it after? I set mine and have never had to touch it again after that point.
No Once its hot I set it where I want it and its good the whole ride. The next time I go to ride I have to do it again.

Ill pull the cable this week and check it out. Give it a good lube. I see what your saying. Thanks
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post #4 of 5 Old 10-17-2011, 05:31 AM
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you need to keep resetting the idle adjust screw each time you ride? you might want to pull that cable and see if it's moving freely as well because if it's not routed properly it may be backing out over time
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post #5 of 5 Old 10-17-2011, 06:44 AM
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After a quick google search i came across this. It should help you out, sounds like your problem:

Quote:
Inconsistent idle speed.

Many people lately have been asking me about idle problems where they will set the idle at 800 or so, then when they drive the car or boat, the idle only comes back to 1500 or so. When they blip the throttle, it will come back to 800. This problem is very likely NOT the carburetor, but the linkage from the pedal to the carb, especially if the car (or boat) has a wire cable linkage.

To diagnose the problem, disconnect the linkage at the carburetor, and manually move the throttle with the engine running. If it comes back to the idle set point, then the problem is in the linkage, which will require repair or replacement. If it doesn’t come back to the idle set point, the problem is in the carb, possibly in the choke’s fast idle linkage. If the linkage is dirty, spray it with carb cleaner. If you're using a spacer or adapter, those can cause interference with the throttle plates, and will need to be fixed.

Occasionally, an engine will have a poor ground, and electricity will seek ground through the throttle cable, making it hot enough to melt the plastic housing. If you see evidence of a hot throttle cable, be sure to check your engine to chassis ground.

Inconsistent idle speed can also be caused by a sticky mechanical advance in your distributor, a particular problem on boats, where corrosion is a major factor. A visual inspection of the advance mechanism is highly recommended.

Another cause of inconsistent idle speed is sticky throttle valves, especially the secondaries on vacuum secondary carbs. Stickiness can be caused by excessive wear, but is most likely corrosion or gumminess from disuse, as in boats and other seasonal engines. The secondaries are held closed by two devices: The spring inside the vacuum actuator, and the link that goes from the primary throttle lever to the closer slot on the secondary throttle valve. In some cases, the actuator spring is relatively light, and doesn't exert much force. If the closer link is not bent just right to touch the slot enough to fully close the secondaries, you will experience a situation where the idle speed will not come down after the secondaries are used. You will need to clean the throttle plate and/or rebend the closer link to get the secondaries closed properly.

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