K&n upgrade

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K&n upgrade

This is a discussion on K&n upgrade within the ZR-7 Performance Upgrades forums, part of the Kawasaki ZR-7 category; I installed a k &n filter and also cut holes in the sides of air box and now bike doesn't want to rev up. I ...

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Thread: K&n upgrade

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    Newbie Ronfra's Avatar
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    K&n upgrade

    I installed a k &n filter and also cut holes in the sides of air box and now bike doesn't want to rev up. I know I need to get a jet kit to riches fuel mixture, any suggestion from someone that has simular mods on their zr7s.....Thanks in advance.

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    Obo
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    Cutting holes in the airbox will cause it to bog down with the stock jets, just like if you try and run it with the airbox or filter off.

    In the meantime you'll either have to plug the holes or wait until you can buy a jet kit.
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    Supreme Being carryall's Avatar
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    Most people will just add holes to the lid of the air box. Just to be sure that the problem is too much air, try plugging up the holes you made and make sure the bike will run as before, so it proves that alone is your problem. (If not, look at a air leak elsewhere) I'd recommend the Ivans jet kit.
    Blue ZR7 with...color matched swing arm, heel plates, bar end mirrors, passenger pegs, F&R blinkers with smoked lens, oil cooler with mesh, carbon fibered side covers with mesh, custom made chin fairing, along with a tail trim, LED underbody lighting, Yoshimura RS3 muffler, Corbin seat, F15 windshield, 17t front sprocket, oil temp gauge, rim tape, custom grips, front spring preload adjusters, different handlebars with risers, Ivans jet kit with air box mod and snorkel removal and AIS removal.

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    yep...if you change airflow in, you change the jetting requirements. Same applies for exhausts. Any time you change the ratio of fuel to air, you have to adjust the metering to get it back where it should be.

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    Obo
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    Quote Originally Posted by carryall View Post
    Most people will just add holes to the lid of the air box. Just to be sure that the problem is too much air, try plugging up the holes you made and make sure the bike will run as before, so it proves that alone is your problem. (If not, look at a air leak elsewhere) I'd recommend the Ivans jet kit.
    I was a little worried when he said the holes ere added to the sides vs the top which is what I've seen recommended elsewhere. Don't know if it would really make any difference (assuming the jetting was done.)
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    Supreme Being carryall's Avatar
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    I was also eluding to the possibility that if the air box was removed to drill the holes in the side, if maybe the boots weren't correctly seated back in the air box when re-installed?
    Blue ZR7 with...color matched swing arm, heel plates, bar end mirrors, passenger pegs, F&R blinkers with smoked lens, oil cooler with mesh, carbon fibered side covers with mesh, custom made chin fairing, along with a tail trim, LED underbody lighting, Yoshimura RS3 muffler, Corbin seat, F15 windshield, 17t front sprocket, oil temp gauge, rim tape, custom grips, front spring preload adjusters, different handlebars with risers, Ivans jet kit with air box mod and snorkel removal and AIS removal.

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    Supreme Being shakennstirred's Avatar
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    Open up the intake by taking the white piece out. take the top off and add some holes to the inside cover that has to 2 small inlets to the airbox.
    But don't drill holes in the sides facing the side panels, you are just inviting water to get in.

    I did put a few extra hole in the back where its facing the battery box, as that it protected from the weather.
    pic shows where.
    BUT DON'T DO ANY OF THIS TILL YOU HAVE A JET KIT FITTED
    4e3bbf3d455c8_DSC01503.jpg
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    Obo
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    Quote Originally Posted by shakennstirred View Post
    BUT DON'T DO ANY OF THIS TILL YOU HAVE A JET KIT FITTED
    4e3bbf3d455c8_DSC01503.jpg
    Think it's too late. If so I'd suggest covering the holes with duct tape for the time being.
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    Supreme Being Doug Hyde's Avatar
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    Yeah, the K&N isn't an "upgrade" unless you're installing a jet kit at the same time; just the opposite. Same for most intake/exhaust mods.
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    I just got a 6 sigma jet kit after cutting 3× 1" hole in each side along with k&n filter. I put the 1.15 jets on both inner carbs and the 1.125 on outer carbs. Put two shims on each needle valve and removed covers on bottom of each carb. And turned them out 2 turns. Wow what a difference you can appreciate.
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    Newbie Ronfra's Avatar
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    Here is the link where I bought mine. Make sure to send email and tell them what mods where done and at what altitude you will be riding above sea level. I live in Indiana so told them 950ft. Above sea

    level...https://www.amazon.com/gp/aw/ya/ref=...310255-8653053

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