Help with Bogging Off the Line - Kawasaki ZX-10R.net
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post #1 of 22 Old 06-21-2009, 11:23 AM Thread Starter
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Help with Bogging Off the Line

I have been battling issues with my bike(2005ZX6RR) bogging off the line for the last couple of months and hoping to get some suggestions. Bike is bogging right is start releasing the clutch which could be due to a combination of factors. I believe the main culprits are: New clutches(30 passes, still look brand new no glazing, blueing,anything), New oil(50 or so passes), and Hot humid weather (1800-2400 corrected altitude). It seemed a little better when I raised the launch RPM to 9K but, still losing way to much time in the 1/8th (3-4 tenths) and ultimately the 1/4(5 tenths). I raised the bike up to stock ride height with only a fork strap and my 60's are pretty close to what I was running slammed and strapped(1.72-1.78 slammed & strapped/1.79-1.82 strap only). I have tried leaning it out and richening it up but, bog still there. I am 42 PSI front and rear and wonder how much higher I can safely take up rear tire pressures as I cannot find a stated max tire pressure for the pilot power anywhere, not even on the tires. Trying to get a little wheelspin to keep revs up. The thing is, the MPH at the top end is not that far off (128-129.5MPH at 2400 corrected altitude) but, am down 1.5-2MPH in the eighth. It appears to me that the bike is breathing well and making decent power up top but, it is killing me the 1st 1/8. It is so frustrating because when you get used to running mid 10s and I am killing it to just squeak into the 10s now.

Thanks everyone!

Dean

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post #2 of 22 Old 06-21-2009, 07:54 PM
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Just deal with it the heat is gonna hurt you.leave the bike alone and race it.
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post #3 of 22 Old 06-22-2009, 06:49 PM
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Originally Posted by pravataracing View Post
Just deal with it the heat is gonna hurt you.leave the bike alone and race it.
I think he was looking for a better answer. If your bike started to decrease significantly on the street would you just DEAL with it, Nah i dont think so.

check and make sure your clutch plates arn't dry and check your stack height.


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post #4 of 22 Old 06-23-2009, 06:35 AM Thread Starter
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I think he was looking for a better answer. If your bike started to decrease significantly on the street would you just DEAL with it, Nah i dont think so.

check and make sure your clutch plates arn't dry and check your stack height.
Thanks for the response codyc. I did not deviate in any way from how I normally rebuild the clutch. I am thinking after getting some feedback from others as well that is is just a combination of a new clutch and hot, humid weather. I am going to try to raise launch RPMs some more and alter the timing of how I release the clutch to keep the engine in the sweet spot. If weather holds out I will try this out Friday. It is supposed to be 95 and humid again. I know that I am not going to set any records in this weather but, I really want to work on my short times and the bog is making it hard.

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Last edited by Micron05rr; 06-23-2009 at 06:37 AM.
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post #5 of 22 Old 06-23-2009, 10:37 AM
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The new clutch and the bad air is the culprit. New plates really need some good scuffing before they will slip like an older clutch, plus bad air and you have a rough combination. The clutch sounds like it is really pulling the motor down.

Try putting some heat into the clutch before the pass. Should slip a bit more that way.
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post #6 of 22 Old 06-23-2009, 10:15 PM Thread Starter
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Originally Posted by 10R_Havens View Post
The new clutch and the bad air is the culprit. New plates really need some good scuffing before they will slip like an older clutch, plus bad air and you have a rough combination. The clutch sounds like it is really pulling the motor down.

Try putting some heat into the clutch before the pass. Should slip a bit more that way.
Sounds like a plan. Pulled the clutches again and they still look brand new so there is definitely no slippage. I will just have to keep working at them.

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10.49 video http://www.youtube.com/watch?v=w_KQhDSCvQA
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post #7 of 22 Old 06-25-2009, 07:13 AM
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It's prolly this heat, you can either raise your launch rpm to get bog out or put some more gear on it.

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post #8 of 22 Old 06-25-2009, 11:21 AM Thread Starter
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Originally Posted by Ruthless Racing View Post
It's prolly this heat, you can either raise your launch rpm to get bog out or put some more gear on it.
Thanks Ruthless! I am going to kick up the launch RPM and let it fly.

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post #9 of 22 Old 06-25-2009, 12:16 PM
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It's prolly this heat, you can either raise your launch rpm to get bog out or put some more gear on it.
you should try -1 front. it helped my 03 636 quite a bit. whats the temp diff.? from when you were runnin mid 10's to now? i know when it was hot i went from 9.70's down to a 9.51 in the fall when it got really cool
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post #10 of 22 Old 06-25-2009, 01:25 PM Thread Starter
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Originally Posted by bgmagma10 View Post
you should try -1 front. it helped my 03 636 quite a bit. whats the temp diff.? from when you were runnin mid 10's to now? i know when it was hot i went from 9.70's down to a 9.51 in the fall when it got really cool
I am currently -1,+4 which puts me right about the rev limiter in 6th going through the 1/4. I have the exact weather conditions on my tuning spreadsheet at home for the day I ran the 10.49 but, I do recall that the combo of temperature and humidity put the altitude right around 1500 ft whereas the track is at 70ft above sea level. Corrected for sea level that run would have been a 10.35 instead of 10.49. The main thing was that the clutch had about 120 passes on it at that time and the fibers were just at the lower limit of factory spec to be replaced. Lately the weather has been 90-95 and 50-60% humidity (maybe 2200-2500 altitude).

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