Changed spark plugs now low idle and stalls - ZX6R Forum
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post #1 of 20 Old 04-12-2017, 03:27 PM Thread Starter
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Changed spark plugs now low idle and stalls

I changed the spark plugs on my 2000 zx6r afterwards it was idling low and died a couple times while riding. i adjusted the idle and took it on a ride but died again when i rev matched while down shifting. when it is idling and i twist the throttle it doesnt seem to want to rev up high. Im a new bike owner and not mechanically inclined. any help is appreciated thanks
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post #2 of 20 Old 04-12-2017, 03:51 PM
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I would work your way back down to the spark plugs and make sure everything is correct, especially the throttle cable routing. When you get down to the plugs, check each one individually for spark. One way to check spark is to pull a plug, attach the plug wire to the plug, ground the plug to the cylinder head by placing the plug threads against the head, short-crank the starter motor, & visually see if the plug sparks across the gap. There's Youtube videos that will show you how to do this.
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post #3 of 20 Old 04-12-2017, 03:54 PM
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Oh and check the plugs are firmly places into the cables.
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post #4 of 20 Old 04-12-2017, 03:57 PM Thread Starter
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I just had the bike idling and checked the header pipes 3 are too hot to touch and one only gets warm i can grab on to it?
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post #5 of 20 Old 04-12-2017, 04:11 PM
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First,, Welcome to the forum.
Second take a minute and say HI in the new members section.
Tell us about your bike, past bikes and of course a picture.

Get an Infrared thermometer, got mine at Harbor freight for $30.
It doesn't have to be dead accurate for checking the header temps, just be able to tell if one or more cylinder is WAY off. If all are the same, it's not plugs or wires.
One or two off you know which ones are acting up.
Where your done with the thermometer put it in the kitchen, works great to make sure the grease is up to 350 for frying foods.

Slowly take the bike apart down to the plugs. Especially pay attention to the air box.
Tubes, hoses and how the air box was sitting on the throttle bodies before you take it off.
Confirm the plug wires don't snap on before you touch them. Might have not seated before.
If the connectors on fine. Move the plugs from suspect cylinders to one running a higher temp.
Report back on what you find.
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post #6 of 20 Old 04-12-2017, 06:10 PM Thread Starter
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i checked to make sure plugs were tight and that caps were pressed down all the way. havent taken it out to ride yet since its raining but it idled normal but when i would twist the throttle it seems to lag still and when i pull it all the way back it barely gets to 10k
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post #7 of 20 Old 04-12-2017, 06:13 PM
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Sounds like one of your plugs isnt firing or misfiring.
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post #8 of 20 Old 04-12-2017, 06:16 PM Thread Starter
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how do you test that and fix it if its the problem?
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post #9 of 20 Old 04-12-2017, 06:23 PM Thread Starter
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if i turn the idle up to 1300rpm and rev it it seems to respond how it should but then it takes a few seconds for the rpms to drop but at 1100rpm it is a poor response when i rev it but rpms drop as normal
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post #10 of 20 Old 04-12-2017, 06:39 PM
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Whoops I just noticed ur bike is carbureted.

Send a message to our member RJ2112. He should know that stuff pretty good.
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post #11 of 20 Old 04-12-2017, 06:47 PM
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Quote:
Originally Posted by DDAW22 View Post
how do you test that and fix it if its the problem?
BUY seeing what's not firing.. Fire = heat.. Heat = higher temps.
Infrared thermometer is a start.. OR do like we did in the old days..
Slap headers, but that only helps for gross not firing. They get hot fast, not quick on the slap. You will loose skin.

OR you can test each plug. If all good then it's a carb on the cold cylinder or injector depending on what you have..

Fist step is to isolate cylinder or cylinders. Next is to figure out the what.
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post #12 of 20 Old 04-13-2017, 09:08 AM
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Did it run fine before you swapped the plugs?
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post #13 of 20 Old 04-13-2017, 02:55 PM
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if it was fine before you done the plugs,is it missing /down on the cylinder?lazy at revving up not sure on your mechanical knowledge,,did you check the sparck plug gap before fitting your plugs?also sometimes what can happen if you tighten plugs you can have slightly the wrong angle causing the plug to snap the porcelain,then causing a dodgy spark.and have you re checked all your pipes to the carbs or possibly knocked something off as there is a few tubes/pipes here and there
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post #14 of 20 Old 04-13-2017, 03:08 PM
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If it ran fine before the new plugs, I would think the cylinder not firing right has the wrong gap, maybe it's way too wide of a gap. Or it was somehow installed wrong. Possibly even the plug is bad. Easiest way to check that stuff is to swap a different plug into that cylinder and see what changes.

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post #15 of 20 Old 04-13-2017, 03:45 PM
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I was just going to say, too wide a gap. On my CB750 it will just not run so good, like slow with flat spots in the rev range, if the gap is too big.

You might pull the plugs and check the gap to make sure it's spec.

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