400Ex Carburetor vacuum hose line question - Honda ATV Forum
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post #1 of 11 (permalink) Old 12-22-2010, 07:45 AM Thread Starter
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400Ex Carburetor vacuum hose line question

I have no idea where the vacuum hose numbered 45 plugs into?
Someone could save the day by letting me know where she goes

Thanks Tony
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post #2 of 11 (permalink) Old 12-22-2010, 10:52 AM
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Welcomee to the forums.... I'm pretty sure that's a vent hose.

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post #3 of 11 (permalink) Old 12-22-2010, 12:00 PM Thread Starter
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So it just hangs lose?? I have a nail in the hose now to block it and the bike runs but fouls the plugs and runs crappy..

It fouled plugs and ended up going into storage for two years.. I pulled it out and cleaned the carbs still fouls the plug but runs even worse then before.

You can only ride for two hours before you have to clean the plug. You can run it longer then that but when you go to restart she just wont have it.

After taking the nail out of the number 47 vent tube any ideas?
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post #4 of 11 (permalink) Old 12-22-2010, 12:57 PM
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It sounds like the air bypass valve behind the black cover may be bad? Also check the choke lever and make sure it is tight and not on the first notch, check the air filter clean it or replace it.

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

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JETTING
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post #5 of 11 (permalink) Old 12-22-2010, 01:29 PM
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Welcome to the forums. I agree with Moose, #45 is a vent line.

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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post #6 of 11 (permalink) Old 12-22-2010, 01:32 PM
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You would be best buying a rebuild kit from MOOSE utility, they aren't but about 20 bucks and well worth it. you probably still have gummed fuel somewhere in the carb.

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
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post #7 of 11 (permalink) Old 12-22-2010, 03:01 PM Thread Starter
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Can i get some more details on the air bypass valve behind the black cover?

I think your right about going with a rebuild kit I will order one tonight and let you guys know how it works out..

Thanks so much for the help
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post #8 of 11 (permalink) Old 12-22-2010, 03:33 PM
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If you haven't done a thorough cleaning on the carb I strongly suggest it.

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
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post #9 of 11 (permalink) Old 12-22-2010, 03:50 PM
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The air cutoff valve richens the mixture slightly when you let off the throttle quickly on deceleration to prevent a lean condition which causes a backfire.

I would go ahead and clean the carb and see what that does.

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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post #10 of 11 (permalink) Old 12-22-2010, 05:37 PM
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Welcome to the Family! 45 is a vent tube. It plugs into a spot on the heat quard plate under the gas tank.

NEVER TAKE A SLEEPING PILL AND A LAXATIVE IN THE SAME NIGHT!
http://www.youtube.com/watch?v=Exbsw5ssn4I
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