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Discussion Starter #1
Hey folks,

I got a 2005 CBR600RR and lately I've been noticing sporadic idle and hesitation/bogging during acceleration at low RPM (above 3-4K everything seems fine). I've read a lot about potential causes in forum archives, but figured I'd poll for ideas specific to my case - below is the link to a short video of what it looks/sounds like. Relevant modifications to the bike are Yoshimura exhaust and K&N oil filter. I can't directly attribute the issue to either - both were put on the bike about half a year ago, and the issues began maybe two months or so back.

[video] hesitation during acceleration [video]

Current plan was:

1. check sparkplugs (replace if needed)
2. swap back stock exhaust
3. TPS?
4. replace fuel pump/filter

But maybe someone has seen this before? Maybe I could cut straight to the chase of the exact faulty part?

Thanks! Any feedback is greatly appreciated!

Igor
 

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The most important thing you didn't tell us is how many miles is on your bike.

Personally it sounds like time to do a valve adjustment. Get you a shim kit, and have fun.

Get a power commander.

Replace your air filter.

Disable your exhaust flapper valve (with it in the open position).

I don't think it is:

Spark plugs, TPS, or fuel pump/filter - however aside from TPS, you might want to inspect those items, and replace.
 

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Discussion Starter #3 (Edited)
The most important thing you didn't tell us is how many miles is on your bike.

Personally it sounds like time to do a valve adjustment. Get you a shim kit, and have fun.

Get a power commander.

Replace your air filter.

Disable your exhaust flapper valve (with it in the open position).

I don't think it is:

Spark plugs, TPS, or fuel pump/filter - however aside from TPS, you might want to inspect those items, and replace.
Thanks for the feedback!

Mileage you can actually see in the video... just over 10K miles.
Air filter got maybe a 1000 miles on it, so I would be surprised if that's what's causing it...

Exhaust flapper valve - what exactly needs to be done there to disable? a write-up link handy maybe...?:angel:
 

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Well with 10k miles it shouldn't be your valves and your air filter should be fine as well. You sure there is actually a problem? below 3,000 rpms your bike doesn't have much power to begin with. The power kicks in around 9,000 rpms.
 

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Discussion Starter #5
Well with 10k miles it shouldn't be your valves and your air filter should be fine as well. You sure there is actually a problem? below 3,000 rpms your bike doesn't have much power to begin with. The power kicks in around 9,000 rpms.
Well, it's intermittent - so I know how it is supposed to run when everything is fine, and I clearly see the difference when it doesn't run like normal...
 

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Sounds more like loose grounds. Could even be loose battery terminals.

Intermittent problems are often grounding related.
 

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Well, it's intermittent - so I know how it is supposed to run when everything is fine, and I clearly see the difference when it doesn't run like normal...
I'm just curious to see exactly what your bike is doing. Can you post your google drive video on youtube? I don't think anyone will download some random file off someone's personal cloud storage.
 

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Discussion Starter #9
So I did take the plugs out today to make a check... what do you guys think? Do these look like there is anything wrong with them? I'm concerned about the pinkish discoloring - looking at Hanes manual, seems like this would clasify as "worn"?






Should all of these be replaced?
 

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Discussion Starter #10
Oh and on another note - can the hesitation/bogging be caused by a weak batter? I have a feeling that my battery is about to go out - it still shows 13+ when tested with multimetere when fully charged, but the charge dissipates really quickly if the bike is not running for long. I already had to jump it like 4-5 times (i get the iterative "click-but-won't-start" scenario fairly often).
 
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