Wanting to build a sleeper 400ex - Honda ATV Forum
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post #1 of 6 (permalink) Old 09-09-2017, 05:33 PM Thread Starter
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Wanting to build a sleeper 400ex

Wanting help and ideas to make a sleeper quad that my boy can ride. All of his friends have 450 or bigger. Thinking about a 440 kit. Already have a Hotcams Stage 2. Thought about an 450 carb or at least a rejetting. And ideas would be great.
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post #2 of 6 (permalink) Old 09-10-2017, 12:07 AM
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post #3 of 6 (permalink) Old 12-06-2017, 07:21 PM
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lmao NOS there ya go!!!

  • 2001 Honda TRX 416ex
  • 2003 Honda TRX 416ex
  • 1999 Honda 300ex
  • 2014 Polaris 1000 xp Turbo
  • 1998 Yamaha PW 80

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post #4 of 6 (permalink) Old 01-25-2018, 04:03 AM
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You could do something as simple as changing your gearing.
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post #5 of 6 (permalink) Old 01-25-2018, 06:39 AM
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Quote:
Originally Posted by Honda_119 View Post
You could do something as simple as changing your gearing.
That's not going to be as effective as a bored out head (416 or a 444)

  • 2001 Honda TRX 416ex
  • 2003 Honda TRX 416ex
  • 1999 Honda 300ex
  • 2014 Polaris 1000 xp Turbo
  • 1998 Yamaha PW 80
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post #6 of 6 (permalink) Old 01-29-2018, 08:51 AM
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I love the 400ex platform. That being said, it might be cost effective to just buy him a 450. It takes alot of time and money to keep up or out run a 450. When you install a big bore there are some other components that need to be present to effectively use the added power. Ive got too much time and money into my ten year build to even remember some of the things ive done. remember once you build it to beat 450's the 450's will just mod and be faster. they can get alot more out of that liquid cooled 450 than we can get out of our modded 400's for alot less!

Former SSQSA Trail Boss
99'-05' 400/450 Woods Killer
Heavily Modified
89' TRX 300 4x4
unmodified
00' Blaster (wifes)
Medium Modified
06' Extreeme Typhoon 90
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