PROBLEMS with zx12r05 throttle HELP!!!

[BiKeR7]

hi everyone i have been looking around your forum and it seems extremely useful.so i have decided to post my problem and hopefully someone can shead some light...
i bought an 11/05 zx12r about 2 months ago coming off a 04 zx10r it only took a few weeks to get into it once i had i found when the throttle is snapped open in second or third gear around 3thou revs it doesnt hit power and feels like its a 600cc then once it hits 7thou it kicks back in as if you were dumping the throttle at 7 thou rpm. the modifications on the bike are yoshi can,power comander and k&n filters.i took it back to local kawasaki where i bought it from and the only thing we could come up with was one other time the mech could remember something like this was k&n filters throwing out air/fuel ratio so we put it on the dyno ran a custom map got 160hp at wheel but didnt fix the problem.this kawasaki store being new to dyno i organised for them to take it up to a different dyno place which would give it a full tune and try sort out the problem.it went up the other day another full tune with custom map was done it got 170 at the wheels this time feels like a new bike BUT the problem still occurs...but now when i dump the throttle and it goes into the funny power loss it wont go over 7thou rpm but as soon as i re adjust the throttle again back slightly it kicks back in....
it has come to the point where qwe are now thoughtless and dont know where to go from here

CAN ANYBODY HELP?????

[Kawi_T]

I own a 2001 ZX12R. I have found that it HATES low rpms. I try to never let it go below 4000. At low rpms it chugs and the throttle response is quite sluggish. It also bogs off the line a little if I let out the clutch to abruptly. As far as I've been able to learn, this is a side effect of the fuel injection system. When the newer model 12 came out this is one of the refinements they worked on. My bike has some minor mods and made 165 HP on the dyno. My only solution has been to adjust my riding style. Off the line it likes a little clutch slide and enough throttle to get it up over 4000 rpms quickly. Once rolling I keep the motor spinning, keeping it over 4000 the whole time. I've also noticed the big surge above 7000. When I ride like this everything seems to work great. The main side effect is fuel consumption. ZX12 eats noticeably more fuel than my friends Busa.

[Kawi_T]

After rereading your post I see yours is an '05. That being the newer model compared to mine, I guess they didn't really fix the FI issue. I really don't find it to be too big of a deal as long as you're aware of it and ride accordingly. Good luck, let me know how things work out or if you figure out any ways to make it better.
Tom