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ATV Riders Forum > ATV Riders Mechanical Section > ATV How To's > Jetting a 400ex

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blacklabel117
fire it up!!!

Registered: Jul 2009
Location: Garnavillo, IA
Posts: 27

ya man the motor was running fine i never did check the plug but wat i was confused about was that ne thing bigger than the 148 it was like studdering rly bad uk so idk man nd i will have to buy a new plug for it to check

__________________
Blacklabelsociety117

fire it up!!!!

1. 05 honda 400ex
2. white bros slip on
3. pro armor nerf bars
4. k&n air filter and a outer wear cover
more to come.....

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07-31-2009 06:12 AM

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f4iracer
Member

Registered: Sep 2009
Location:
Posts: 85

What's the best place to find a shim washer for these newer 400ex's? My needle is not adjustable.

I'm running a uni filter with a slipon and all i have right now is just a 152 main and stock pilot.

Starting it is ****ty so i'm going to put a 40 or 42 pilot in, what do u guys think?

Also, i'm gonna try a 155 main, i think it's lean since i've done the air filter mod. It was jetted pretty good with just the slipon before i put the uni in, but now i need more.

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2007 400ex

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11-21-2009 05:58 PM

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