2003 400ex. What mods after piping?
Oct 2, 2004 | 07:00 PM
#1
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Weekend Warrior
Joined: Aug 2004
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2003 400ex. What mods after piping?
I just threw on a White Bros E-series pipe on my stock 400ex. It will not stay running once it gets warm unless I have the choke fully on and even then it will die out after a few minutes. What do I need to do? Will just jetting it do the trick? If so, what size? I live in Michigan and do most of my riding in the Baldwin area and at Silver Lake. HELP!!!
Oct 2, 2004 | 07:10 PM
#2
Elite Pro Rider
Do you have a balloon?
Do you have a balloon?
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2003 400ex. What mods after piping?
Yeah don't even start it again without re-jetting the carb. If you have the air box lid on about a 155 main jet, without the lid a 170 or so. You could also go up one on the pilot and pick up the needl jet one spot.
Oct 13, 2004 | 04:58 AM
#3
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Weekend Warrior
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2003 400ex. What mods after piping?
Hey Tractor....I put a bigger pilot and a 160 main and it rips! Thanks for the heads up. She runs a little rich now though. If I back off the mixture screw is it gonna mess up bad or should I run it for awhile and see how it does? I don't even need the choke to start now...and I get the tell tale black smoke puffs after it sits for a few.....
Oct 13, 2004 | 11:40 PM
#5
Elite Pro Rider
Do you have a balloon?
Do you have a balloon?
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2003 400ex. What mods after piping?
Yeah the air screw won't help much. Try a 155 main jet and see if that cleans it up any. If you just ride sand you can open your air box and go up to a 175 or so. That will get you more top end power.
Oct 14, 2004 | 06:42 AM
#7
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Weekend Warrior
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2003 400ex. What mods after piping?
I thought it was just me when I noticed that slight reduction at top end.
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Oct 14, 2004 | 07:09 AM
#8
Pro Rider
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2003 400ex. What mods after piping?
Originally posted by: KevinCallahan
I thought it was just me when I noticed that slight reduction at top end.
I thought it was just me when I noticed that slight reduction at top end.
Oct 17, 2004 | 06:31 PM
#9
Pro Rider
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2003 400ex. What mods after piping?
i would say get a new carb like a 36mm mikuni and i would also run it with a vented airbox lid or without one but without one you bike sounds alot different i would get a k&N air filter or a uni, if you have the money i would put a big bore kit on it and then you pust it up to a 440 with a proformance or a toruqe cam with profermance valves also i would have it ported it. this will give you all the power you need and all the power that you will need.
1988 250x
big bore kit
hole shot tires
FMF pipe
fly handle nars
AC grab bar
proformance cam
proformance valves
ported and polished
1988 250x
big bore kit
hole shot tires
FMF pipe
fly handle nars
AC grab bar
proformance cam
proformance valves
ported and polished
Oct 17, 2004 | 11:00 PM
#10
T Rex Rider
What irritates me is!
Those 6-packs work pretty good.
What irritates me is!
Those 6-packs work pretty good.
Joined: Jun 2003
Posts: 16,801
Likes: 1
From: Oeste Del Tejas
2003 400ex. What mods after piping?
Keep in mind your pilot and needle don't quit flowing because you have it at full throttle. The size of pilot and position of the needle clip can affect the size of main you need. So can elevation, temp and airbox mods.
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