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Hi I am loosing battle with my 1997 zx6r can I just clarify the previous owner fitted black widow headers and collecters has a scorpion end can and a k and n air filter but never done anything to carbs bike had a splutter at 6krpm to 7krpm I have since

1 fully stripped carbs cleaned everything (3 times) at least
2 replaced All filters
3 replaced fuel pump
4 balanced carbs
5 replaced plugs and new plug wires
6 after market needles (3rd clip)

After all this I still having small stutters low down and bike powers through the 6k now but hesitate if riding bike flat out runs perfect but value my licence after 3 weeks of searching and trying different things I just come across info saying I could do with changing my Jets because of the full exhaust and k and n could really do with some help here and possibly a link to some Jets
 

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It's hard to perfect the fueling in the first place so are these headers and can designed to work together? If there is a serious hole created by mix matching exhaust system components than fuel tuning may not be able to smooth everything out. If I were you I would try a cheap bike specific full system exhaust with the jetting values that go with it.
 
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