400ex performance help

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Aug 22, 2006 | 04:58 PM

mounty

Thread Starter

Weekend Warrior

Joined: Jun 2006

Posts: 1

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400ex performance help

does ne body know if and how much power would be gained from removing the snorkels and drilling holes in the airbox lid? also would i have to rejet? let me know if you have found ne cheap/easy mods for performance

Aug 22, 2006 | 05:02 PM

reconranger

Red Rider
Honda, accept nothing less!

Joined: Dec 2002

Posts: 12,733

Likes: 1

400ex performance help

Those mods are going to improve any machine. You will also want to uncork the the exhaust, if possible.

Some cheap UNI 1" round airbox vents should work well installed in the lid.

Aug 22, 2006 | 05:25 PM

TRX450Rrider

Trailblazer

Joined: Jun 2006

Posts: 77

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400ex performance help

Anytime you open up the airbox and modify the exhaust you will need to rejet.

Aug 23, 2006 | 05:11 AM

JLsparky7

Pro Rider

Joined: Mar 2004

Posts: 1,763

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400ex performance help

I got a filter, yanked the snorkle off and drills 4- 1/2 inch holes in my airbox and it brought the jetting to where its supposed to be. They always jet rich from the factory.