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This is from my experience with 4 ZX-6R's (3-01's & 1-99 race bike). If you put a K&N and slip on on you DON"T have to rejet the bike. The main problem I came across with all the bikes was the carbs wernt set very well from the factory, only 1 of the 4 was close. I recommend to re-synchronize all 4 carbs and adjust the air mixture to within factory specs. My bike always had less power and was slower than the other 6R's till I fixed the carbs. After that my bike went from the slowest to the fastest. I did jet kits on 3 of the 4. With the jet kit installed you WILL notice a gain in performance will a small price. Depending on how you install the jet kit you will either gain low end and lose a little top end or lose a little low end and gain top end. On 2 of the bikes (1-01 & race bike) the kits were installed for more low end. The other 01 was for high end. I like the more high myself. The bike wakes up around 10,000rpms and pulls all the way to redline. It also gain quit abit of topend speed compared to stock, but has less power below 6,000rpm. How you install the jet kit is gonna effect at what rpm your bike starts making all of its power. I dropped one tooth on the front of the 01 setup for topend and it is still faster than the other 01 set up for lowend with stock gearing. Now the only bike out of all these that will do a 2nd gear power wheelie is the 99 race bike, I think due to it being gutted and having shark skins. I hope this helps anwser some of the questions I see on the board all the time. Please feel free to comment or ask questions.

2001 ZX-6R
http://mywebpages.comcast.net/minytrker/bike.htm
http://www.knology.net/~minytrker/
 

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Did you sync and adjust the air mix on your carbs yourself? If so how did you do it and was it hard? Just wondering. I know it will be costly but I want to run a full Akropovic system, factory jet kit, and a K&N filter. That should do just what I want.

Loose is fast and on the edge you're out of control.
 

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I do all of my own maintance and mods. It wasn't very hard to do, the hardest part to me was drilling out the brass plug for the air screw. I bought a carb sync tool like this one. http://www.denniskirk.com/powervendor/details/detail.asp?serverid=nlStreet&PartNo=28273
I also have the service book for my bike which has nice diagrams of the carbs. But its all trial and error on what level to put the shims on the needles. Worst case is you have to take the carbs back off and move the shims one notch lower or higher. If you follow the instructions in the jet kit it work out on the first try most of the time.

2001 ZX-6R
http://mywebpages.comcast.net/minytrker/bike.htm
http://www.knology.net/~minytrker/
 
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