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Discussion Starter · #1 ·
I've posted this on another board. Let me know if anyone has any ideas. I'm just not convinced that nothing is wrong with it.
http://www.sportbikes.net/forums/showthread.php?s=&threadid=128609
I've got an '03 ZX6R with 850 miles on it. I've noticed that it's a little flat up to 5000 RPM. Once It revs up to around 5500-7000 RPM it's like a rocket. I took it to my dealer and they couldn't find anything wrong with it. Maybe I'm getting used to it and just need to adjust the way I ride it and rev the engine more when I take off. Should I be worried about anything?
 

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thats normal...power band is around 6500rpm and 8000rpm
 

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Your "powerband" guys is your entire rpm range. There is no such thing as a "powerband" that kicks in at a certain rpm. It is a description of the power produced at EVERY rpm range from idle to peak. The graph a dyno prints out a VISUAL of your entire powerband.

Also, changing gearing doesn't alter where your bike makes power in the rev range, it changes how the power is translated to the rear wheel. It might FEEL like your engine is more potent earlier on, but truthfully it's still the same... powerband.

Just a l'il pet peeve of mine... and I knew what you were trying to say...

Cheers.
 

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He meant the front camshaft sprocket ;)
Yeah, altering the final drive ratio doesn't adjust the bowerband, it adjusts the vehicle speed that the powerband is most noticable at.

BC.
 

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Welcome to the world of 600s. You have to rev the tits off 'em to get them to go.
 

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Discussion Starter · #9 ·
Originally posted by -gary

Welcome to the world of 600s. You have to rev the tits off 'em to get them to go.
Well, I was just a little concerned that something was wrong. It seemed to have a little more low end in cooler weather. I'm starting to keeps the revs up more and it's made a big difference to the fun factor!
 

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"You have to rev the tits off 'em to get them to go"

never heard it put that way before....
 

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These things do seem to be affected quit a bit by air temp. I notice a huge increase with a 20 or even a 10 degree drop. Much more so than a car.
 

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Discussion Starter · #12 ·
I really appreciate the help I've gotten on this board. Hopefully I'll be able to offer advice someday! Thanks!

" "You have to rev the tits off 'em to get them to go"

never heard it put that way before...."
I've never heard that before either...but you gotta like it!!!
 

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"most people refer to it as the area where the bike makes its most significant power, ie: 8000-14000 rpm's," -cdn

lets call it band of power then
 

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Wouldn't getting a good full exhaust and then rejetted help increase power? I've seen some dynos really impress me with a significant bwp increase, however I've seen other dynos that wouldn't seem that it would be a good investment to ever get a full exhaust system.

I understand the whole powerband debate here. If you have a 600 engine your powerband is going to stay the same for the most part no matter what you do.
 

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Yeah, CDN is bang on...

Most aftermarket exhaust (full system) manufacturers openly admit that in order to get the most top end peak power gains, they have to design a pipe that sacrifices SOME very low-end power, where racers never need to be anyway. We're talking 5,000 rpm and under generally, but yeah, that sounds like the range this fella was interested in boosting...
 

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Discussion Starter · #18 ·
I went for a ride on Saturday and the bike ran great. The air temp was about 83 with very low humidity. I think that higher humidity impacts this more on my bike. Which forgive my stupidity, but I thought that the fuel injection would not be as sensitive to this. At least now I know that there's nothing wrong with the bike.
 

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Most bike fuel injection (including the ZX-6R) is open loop. The fuel delivery is not altered for differences in altitude or atmospheric conditions.
 

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I thought that was closed loop. Meaning, unaffected by outside variables?
 
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