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red4ever
11-03-2006, 06:22 PM
is there any way to put on a k&n filter without rejetting without your quad running too lean
400exfan19
11-04-2006, 10:18 PM
im pretty sure u have 2 rejet it but im not sure
Kaleigh
11-05-2006, 12:20 AM
tape some of the filter up.. tape in little sections til your quad stumbles at WOT.. then take a little bit off til it stops stumbling at WOT...

thats the only way without jetting..

cause you have to limit the amount of air getting in..
250exkid
11-05-2006, 08:50 AM
ya gotta rejet, its just better to rejet then doing the taping it up trick.
H_W
11-06-2006, 05:17 PM
Originally posted by red4ever
is there any way to put on a k&n filter without rejetting without your quad running too lean

Not really, I mean you are letting in more air, so your engine needs more fuel or else it will be running lean.
04TRX400EX
11-06-2006, 10:18 PM
We run a K&N on my dad's stock 400EX and it runs fine. I have a K&N on my 400 as well but also an exhaust so I rejetted the main and needle, and adjusted the air/fuel mixture. I don't think a K&N will let in that much more air that you have to rejet. See how it runs at wide-open throttle.