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Regulators
10-27-2011, 03:04 PM
400EX carb is leaking fuel out the right side of the carb, its bogging each time you hit the throttle, any suggestions as to why this is happening? thanks in advance

Link to video \/

http://i33.photobucket.com/albums/d91/Josh662234/th_IMG_1399.jpg (http://s33.photobucket.com/albums/d91/Josh662234/?action=view&current=IMG_1399.mp4)
JOHNDOE83
10-27-2011, 03:28 PM
The oddest carb problem this site has seen! ^
Reece616
10-27-2011, 04:10 PM
Where the gas is leaking out looks like it's missing a piece.
The spot to the right looks how both of them should I believe.
I would say it's bogging because ur fuel is going out that hole rather that into the head.
Reece616
10-27-2011, 04:14 PM
you can see what I mean in the attached picture (from the service manual)
pitbiker2269
10-27-2011, 05:00 PM
its hard to tell from the video but it looks like that little brass ball in the service manual pic might be missing?
AtvKid4Eva
10-27-2011, 05:55 PM
yep, your missing the little brass ball in the pics above. Im not sure how it could have fallen out tho? lol
Regulators
10-27-2011, 08:54 PM
hmmm, looks like you guys are on to something here.

anybody have a color photo of this side of the carb so i can see what its really supposed to look like?
gonna go through google images for about ten mins then the parts manual

thanks!
Regulators
10-27-2011, 09:48 PM
after much searching i cant find any good pictures of the right side of the carb, with the blk plastic cover removed :(

the parts diagram is nearly impossible to read seeing how it doesnt show that side.

any1 out there with a picture of that side? or a carb in the garage they can snap a picture of? your help is greatly appreciated

thanks
josh
CJM
10-28-2011, 07:55 PM
I have a feeling your going to be buying an entire carb for that one little piece. its the kinda part that is integral to the carb and not separate I think.
AtvKid4Eva
10-28-2011, 08:20 PM
yeah, you should be able to pick up a used 400ex carb on eBay for around $50 maybe less..thats probably your best route.
Regulators
10-28-2011, 09:34 PM
:-(
that's what I was afraid of.
think I should go for the 450 carb? is it worth it? Basically stock 400 motor wise
CJM
10-28-2011, 09:55 PM
Originally posted by Regulators
:-(
that's what I was afraid of.
think I should go for the 450 carb? is it worth it? Basically stock 400 motor wise

Its worth it if you can find one for a good price. It adds power, very noticeable. Id also do an exhaust and a sparks key while your at it and maybe a stage 1 hotcam. Will be like a whole new bike.
Regulators
10-28-2011, 10:21 PM
it has an FMF and a K&N, but what's a spark key? only 04-05 450 carbs fit right?
CJM
10-29-2011, 09:50 AM
Originally posted by Regulators
it has an FMF and a K&N, but what's a spark key? only 04-05 450 carbs fit right?

Sparks key is a timing advance key. The 400ex has a slightly retarded ignition setup. Put the advance key in the flywheel and it advances timing 6 degrees and makes a bit more pep. Its only recommended for quads with 10:1 comp ratio or less.

Yes, only a 04-05 carb fits easily. Others will fit like an FCR but require more work and are harder to adjust.
rooster300ex
10-29-2011, 10:00 AM
Just seal it up with some seal all. IMO no need to buy a whole new carb because of that. That is weird though. Wonder how it came out??
CJM
10-29-2011, 10:20 AM
Originally posted by rooster300ex
Just seal it up with some seal all. IMO no need to buy a whole new carb because of that. That is weird though. Wonder how it came out??

Trust me when I say this: No matter what sealant you put on there it will get eaten by gas. The only real way to seal it is to braze it closed or weld it shut. Since tig welding such an area is very hard, brazing and or soldering it shut would be best. Problem comes then with heating up the carb to much possibly when brazing and or soldering.

Might be worth it to just try and take a screw, tap some threads into there and throw some rtv gasket maker in the hole and on the screw-but no guarantees it wont leak.
rooster300ex
10-29-2011, 11:18 AM
Originally posted by CJM
Trust me when I say this: No matter what sealant you put on there it will get eaten by gas. The only real way to seal it is to braze it closed or weld it shut. Since tig welding such an area is very hard, brazing and or soldering it shut would be best. Problem comes then with heating up the carb to much possibly when brazing and or soldering.

Might be worth it to just try and take a screw, tap some threads into there and throw some rtv gasket maker in the hole and on the screw-but no guarantees it wont leak.

I thought the tap some threads in there also. That would be way better.
Regulators
10-29-2011, 05:04 PM
Originally posted by rooster300ex
I thought the tap some threads in there also. That would be way better.

i like that idea. probably try it tomorrow
Regulators
10-29-2011, 08:09 PM
can i solder it with an electrical soldering gun?
probably not huh?
CJM
10-29-2011, 10:09 PM
Pencil torch might work since its small enough to get in there. The big Q is can you heat it up...IDK.

Whats possible is to tap some threads in there for a machine screw then fill the sucker with RTV and see what happens. Easier than brazing/soldering it shut.
Regulators
10-30-2011, 04:03 PM
after closely examining the carb, any brazing or inserting of a screw will block where the fuel is coming up. :(
so Baileygunns chimed in and is shipping me a carb tomorrow morning :-D
big thanks to him and the rest of you for your excellent input/ideas
CJM
10-30-2011, 06:30 PM
most excellent, this forum is full of good people!