03 400ex
Just bought a 2003 400ex last month and I love it, but I'm ready to do some modifications to it. I want to keep the reliability of it.so what are some cheap mods that will give me more power? without having to use a big bore kit. Thanks a lot in advance
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New exhaust and rejet, possibly better air filter. Re gearing it may help move power where you need it too.
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Originally Posted by Scooter86
(Post 3335904)
New exhaust and rejet, possibly better air filter. Re gearing it may help move power where you need it too.
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Uni for the filter. Just about any exhaust. I like hmf, but I have never had a 400ex either.
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The Honda forums suggest:
1) Uni filter 2) FULL HMF exhaust 3) Air box mod - (I used to drill 1" holes) - just don't go river wading :P |
I owned a 2001 400ex I could run with the 450r go get a 15 tooth front sprocket and can't remember the rear it was the smallest size eBay has. A hmf comp series exhaust uni air filter and to really wake the Beast up go with the stage 2 hot cam no engine work needed other than stage 2 jet kit you will see a huge difference oh and stage 2 Rev box. Hope this helps you
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For the air box mod I cut out a section in the center about 3"x3" works great and use a good air filter oil on the uni
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You could run an aftermarket airbox lid. The gearing changes would help you run with a 450 on top end, but seems like it would really kill your bottom end, acceleration, and trail riding ability.
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Full hmf system and Rev box are a must if setting up a 400ex. My 01 ran like a beast when I first added these. I then added the 440 kit and alot of other mods but right off the bat I recommend those two things.
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Originally Posted by Scooter86
(Post 3338289)
You could run an aftermarket airbox lid. The gearing changes would help you run with a 450 on top end, but seems like it would really kill your bottom end, acceleration, and trail riding ability.
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