[pow-z]

I adjusted the epa screws and all the low end bog stopped. The bike runs very good now. Can a stock bike be improved with a k&n filter?

 

[Martin64]

You bet! But if you add too much to the "inhale", then you have to start adding to the "exhale". But the K&N is a step up from stock. Plus it's a "lifetime" filter, so you can throw the stock filter in the trash (which is what Kawasaki recommends periodically, anyway. But they don't tell you to go aftermarket. They recommend reinstalling their own junk).

 

[Tom Bozeman]

K&N --

Yes the K&N is a very good improvement over that stock foam crap, just make sure you oil it uniformly. And after that, consider a Muzzy slip on, or Yoshi slip on, or D&D, or Kerker, or Micron, and, oh well the choices are many. Tom

I have a K&N filter and the Yoshimura round race slip-on pipe on my ZR7 and with about 1600 miles of weekend riding only -- happy as can be.

 

[pow-z]

what about the gas reburn valve removal. what difference does it make to take it of.

 

[Martin64]

There are posts here that tackle that one. I don't think it will help a stock machine, but if you've changed the can it helps eliminate the popping during deceleration. Go to the home page and check it out in the maintenance section.

 

[zr7erik]

Hi Tom,

Did you re-jet with the Yosh and K&N, or leave the stock jets in?

Thx!

 

[pow-z]

just adjusted the epa screws

 

[TheScamp]

Is there a FAQ on adjusting those screws? I've looked, but can't find anything.

 

[Andy]

Hi Scamp,

There is a link on zr-7.com under the maintenance section. It shows how to remove the carbs and how to remove the plugs so you can get to the idle mixture screws (aka pilot screws).
http://www.zr-7.com/HoleshotJetKit.htm

Another way to do it without removing the carbs is to use a dremel tool and cut a slot into the carb.
http://www.softcom.net/users/bilvanek/mixture.htm

I did it the first way by removing the carbs. Its not too difficult. It took about an hour.

Andy

 

[Tom Bozeman]

Hi Tom,

Did you re-jet with the Yosh and K&N, or leave the stock jets in?

Thx!

Not yet Erik, but I am going to have to. I'm getting to much popping noise from the pipe on downshifting and I've had one loud backfire when I bogged the motor down coming out of a turn in to high a gear. Tom

 

[jarelj]

Tom -
Rejetting won't get rid of the popping on deceleration, removing the EGR assembly. Very simple, takes about $2 worth of materials from the auto parts store and 15 minutes of your time. http://www.zr-7.com/egr.htm

 

[Tom Bozeman]

Thanks Jarel. I was a bit confused on why and when to re-jet. Other than that "popping" the ZR runs just fantastic w/o the re-jetting. And the Yosh pipe is great (I might add). Tom