Air Box 400ex

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Jun 13, 2003 | 03:26 AM

400ex2003JPC

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Weekend Warrior

Joined: Jun 2003

Posts: 25

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Air Box 400ex

Could someone help me out on how to modify a 400ex airbox for better performance...and some other things to help out the top end..thanks alot.

Jun 13, 2003 | 04:23 AM

PADZZ

Pro Rider

Joined: Oct 1999

Posts: 922

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Air Box 400ex

16T sprocket if you're looking for top speed. Remove the air box lid or drill holes in it. Be sure to go up a size or 2 on the main jet if you do any air box mods.....

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