Big thanks to Zxdave for helping me out with answering all my annoying questions regarding this mod.
I was wrenching on the MV earlier today putting on a ti rear subframe and thought i could probably do the 2ndary butterfly valve mod on the ZX while i'm in the mood. Now i know kawi's relatively well as i had a 07 6R and did also sorts of mods on it myself. THe 10R was a lot easier and better to work on.
In terms of easiness, I just took the airbox cover and the air-filter holder and the duct out, everything else remained intact. I just worked my way around the velo stacks and just used a #2 screwdriver and got the screws out one by one and then the valves. Simple enough, no heat , nothing.
Impressions: I'm at a 1000 miles now and know the powerband kind of well at this point. After this mod, it seems like there the little bit that the 08 lacked is taken care of with this mod. It DEF feels like the front will come up at 4-5k now or even earlier if you have the balls to keep it pinned lol. With almost 30 miles with this mod in the twisties I don't think the mod affects mid range or up top at all but I can definitely tell you that down low is way diff, more power for sure.
I was thinking about doing a front sprocket change but no need now, i'm VERY happy with the bike. Now it has the bitching low end that matches how insane the top is!
Oh and I also did some quick tests in going WOT in like 3rd or 4th gear, and there is no lag as I thought there might have been. Response is instaneous as before, there is no rough idling, theres no roughness at all anywhere. Just more power.
As I put more miles after this mod (stupid weather) I will have more detailed feedback. THis will be my fifth valve removal on the bike (counting the exhaust butterfly valve
) and I gotta say, I am LOVING these free mods! Any naysayers or doubters, do the mod, you will not regret it.