Just about everyone that adds a header is going to have some low end response issues. Those being idle hunt and low rpm stumble/flat spot to some degree. The best way to deal with it is to have the bike mapped correctly and the pilot jet mod. The map is a bike by bike issue and the pilot jet mod helps all modified bikes. It will never run as good as stock on the low end, that is the sacrifice you make for high RPM horses. But you can minimize it to the extent where its hardly noticeable. The jet mod will smooth it out considerably and helps with the idle some too. This link should explain everything about how to do the pilot jet mod: pub56.ezboard.com/fkawasakizx12rfrm1.showMessage?topicID=6026.topic
I have a full Yosh header, K&N's, Yosh EMS, timing advanced +3 to +4 degrees, pilot jet mod, and the bike runs very smooth at low RPMs. It still has a bit of idle hunt when its cold but that goes away as soon as the bike warms up.
Advancing the timing about +4 seems to give real good results and is still resonably conservative enough to where you aren't going to have any problems as long as you run super unleaded. Gives the bike a different feel. Makes it rev more like a dirt bike.
2003 Ace Performance cyl head
A1 cams at 105/108 CL
2000 short block.
Cooper back cut trans
Stock crank and rods
KZScott preped Wossner 1199 turbo pistons.
Didn't want to let perfectly good parts sit on the shelf.... :)
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Looking for some answers on a dyno jet quick shifter for my ZX 12 R here's a couple photos of the one I have we are having a nightmare of a time getting this connected any information advice pretty much anything anybody knows about this would be truly appreciated thank you all