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Just replaced spark plugs, now runs rough in high rpm
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Just replaced spark plugs, now runs rough in high rpm - July 8, 2012, 08:32 PM

I bought My 2000 R6 about 4-5 months ago. It was running ok...with some high rpm on idle, but after riding for a month or so, the bike seemed to be running pretty darn good.

This weekend I changed the oil, the spark plugs and cleaned the stock air filter.

I started her up and she idles like a champ, no problems. However, when I took her for a ride last night, I noticed that she was having trouble under power. When I am in gear and going she sometimes felt like she was missing and I was not getting the power that I am used to. I used the same plugs that I took out (NGK CR10EK). Am I missing something? I am shocked on what could have happened in the whole tune up process. Nothing was wrong until I changed the plugs.

NOTE: I also checked the gaps for the proper gap size and they were all around 0.027 in. Which checks out ok in the service manual...

Any ideas fellas?
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July 8, 2012, 08:46 PM

Wires?


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July 8, 2012, 09:03 PM

2000 r6 is carbureted right?

you mentioned having a funny idle before cleaning your air filter and an improvement after. I wonder if you uncovered something with your carburetor's tune in the process at presumably, high RPM / open throttle.


*Not intended to be a factual statement.

Last edited by Rail; July 8, 2012 at 09:08 PM..
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July 8, 2012, 10:18 PM

1) did you pinch a fuel line?

2) when replacing sparkplugs, did you seat them properly? As in tighten them, un-tighten them half a turn and then doing a final tightening? You could have a slight leak.

Other than that simply retrace what you did and look for f-ups.


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July 8, 2012, 11:08 PM

I'd wager that the fuel line got kinked slightly in the process. Or there is a vacuum leak somewhere along the way, a vacuum leak will cause high rpms and low rpms but it depend on the severity of the leak.


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July 9, 2012, 07:54 AM

Quote:
Originally Posted by Fitz View Post
Wires?

Fitz, I dont think its the wires as everything was running good before the plug replacement.


Quote:
Originally Posted by Rail View Post
2000 r6 is carbureted right?

you mentioned having a funny idle before cleaning your air filter and an improvement after. I wonder if you uncovered something with your carburetor's tune in the process at presumably, high RPM / open throttle.

Rail, the funny idle was not fixed by cleaning the air filter months ago...the idle was fixed more or less by the seafoam that I was adding to the fuel, and to the idle dial on the right side of the bike. I got it to where it was running very good.


Quote:
Originally Posted by Leoallafila View Post
1) did you pinch a fuel line?

2) when replacing sparkplugs, did you seat them properly? As in tighten them, un-tighten them half a turn and then doing a final tightening? You could have a slight leak.

Other than that simply retrace what you did and look for f-ups.
Quote:
Originally Posted by HumanNippy View Post
I'd wager that the fuel line got kinked slightly in the process. Or there is a vacuum leak somewhere along the way, a vacuum leak will cause high rpms and low rpms but it depend on the severity of the leak.
Leo/Nippy, the possibility is there that I potentially pinched a fuel line, however the problem that I am having is intermitent and happens 50% of the time. The other 50% of the time the bike performs like it should. Thats the confusing part. Also, if I kinked the fuel line, wouldn't the bike idle funny? The bike is idling very good.

I think I will check on how the spark plugs are seated and get back to you all. Thank you for your help.
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July 9, 2012, 07:59 AM

Should replace wires when replacing plugs. Possible also something got routed wrong and a wire got messed up (this happened to me, and produced the same symptoms you described)


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July 9, 2012, 08:02 AM

Quote:
Originally Posted by Fitz View Post
Should replace wires when replacing plugs. Possible also something got routed wrong and a wire got messed up (this happened to me, and produced the same symptoms you described)
+1

replace wires regardless...


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July 9, 2012, 08:09 AM

Quote:
Originally Posted by Fitz View Post
Should replace wires when replacing plugs. Possible also something got routed wrong and a wire got messed up (this happened to me, and produced the same symptoms you described)

Ok, I'll give this a shot... Any recommendations on where to pick up new plug wires?
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July 9, 2012, 08:28 AM

I hope this isnt a dumb question tho....but you guys do know that I do not have traditional spark plug wires, right? I have ignition coils. There are wires that plug into these of course, but I cannot find any replacements anywhere and I personally do not think they are meant to be replaced.
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July 9, 2012, 08:33 AM

Quote:
Originally Posted by portermg View Post
I hope this isnt a dumb question tho....but you guys do know that I do not have traditional spark plug wires, right? I have ignition coils. There are wires that plug into these of course, but I cannot find any replacements anywhere and I personally do not think they are meant to be replaced.
Yeah. I just googled and it appears you are right.

*shrug*


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July 9, 2012, 08:35 AM

Make sure the coils are seated all the way in. You should feel a clicking as you push them on. I have seen a many times the owner change plugs and then the bike does not run right. Also when it is warmed up use windex and spray the headers. The spray should evap the same across all tubes. If it does not then maybe you have a dead coil. Or maybe a fuel problem.


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July 9, 2012, 08:48 AM

What Mike said. Drop a good push on those coils. Sounds like they are a bit loose and that's causing contact issues at higher RPMs.


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July 9, 2012, 09:28 AM

I agree to make sure the coils are pushed down all the way.
If you had to dump in sea foam, your carbs probably need some TLC. There could could be some debis in the main jet or they could be in dire need of syncing. Do you know if there is a jet kit installed?


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July 9, 2012, 09:48 AM

My coils went bad. Read the thread below. It sounds like the same thing you have going on. I'm going to bet that your coils aren't pushed down all the way.

ZX6R acting funny - what's wrong with it?
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