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Old 04-17-2012, 05:17 PM   #1 (permalink)
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07 400ex Re-jetting questions

Hi all, long time no see. I just ordered a new exhaust slip on(hmf), jet kit, and kn air filter. My question is, how hard is it to rejet a 400ex?I believe I can install the pipe my self, but I am worried about doing the jetting, I'm just afraid to mess something up as the bike runs fine right now. Thanks for the help!!!


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Old 04-17-2012, 07:38 PM   #2 (permalink)
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The jets are very easy to change once you get carb off. If your unsure where they go, look at the service manual
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Old 04-17-2012, 07:43 PM   #3 (permalink)
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You actually don't have to pull the carb all of the way off.You can loosen the carb boots and turn it sideways to access the bowl.Remove the hex plug in the bowl and the main jet is right there.
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Old 04-17-2012, 09:45 PM   #4 (permalink)
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so it is pretty easy eh? anyone have pics or illustrations of the jets ( i have no clue what they look like) lol
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Old 04-17-2012, 11:24 PM   #5 (permalink)
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The main jet is the only jet that you can change through the hole in the bottom of the bowl, but the main jet is only one you need to change anyway.

Click the image to open in full size.
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Old 04-18-2012, 10:39 PM   #6 (permalink)
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thank you very much, i only need to change that one jet eh?
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Old 04-18-2012, 11:44 PM   #7 (permalink)
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Quote:
Originally Posted by banditalex View Post
thank you very much, i only need to change that one jet eh?
Yeah, generally, when jetting for the addition of a pipe and filter, all you need to change is the main jet. And you're welcome.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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Old 04-19-2012, 06:16 AM   #8 (permalink)
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Hear is a link that will help you get to the picture Helmut posted... Its technically for a pilot jet but the main and pilot jets are right next to each other...

Honda 400EX ATV Pilot Jet Insturctions - ATV Technical Articles
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Old 04-19-2012, 01:44 PM   #9 (permalink)
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Thanks Dan, I appreciate it!!! When they come in I'll let ya'll know how it went
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Old 04-20-2012, 05:40 PM   #10 (permalink)
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You don't even have to loosen the boots and twist the Carb.
just flip up your choke lever, disconnect the oil breather tube , cover with the paper towel in case you accidentally drop your jet it won't fall into it.
18mm wrench, take off Carb drain bowl, insert 4.5 mm socket into Carb and get it on the main jet and remove.
When reinstalling, do not over tighten the jet or Carb bowl, they will strip very easily
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