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Some have posted that adding a K&N air filter will make a 98 zx-9 run lean with stock exhaust. Well, i installed one and it was running lean. So I put a Factory jet kit in and now its real smooth..the settings are as follows
Float height: 13 mm
main jets: 155 outside, 158 inside
fuel screws: 2.5 turns out
needle: Supplied in kit, use clip on fourth slot from top of needle. Place one shim below clip and one above. (So it's on position 4 1/2)

It takes about 5 minutes to warm up, then hums right along....
 

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From what my kawi dealer told me a K&N filter is a waste of money. if you need to have your bike jetted to make an air filter work properly it sounds like they are right.
 

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I was told by Muzzy's to use the stock filter on my '98 9r when I was setting mine up, for what it's worth.

<font color=green>If your elbow isn't touching, what's the point in riding?</font color=green>
 
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