Feeding vents to airbox

[john pavkovicMember]

Hi guys,

Am thinking of feeding some of the vent hoses from the carby to the airbox to reduce the chance of filling the carby with water.

1/ Want to know if the bulls think it is a good idea or not for the DRZ400??
2/ If so, which ones do you run?.

I’m concerned, ( not so much if you drop it in a crossing its going to fill up anyway)but more so stopping halfway across with the vents underwater. It’s happened before with the bike coughing and spluttering nearly stalling.

Searching techeads
holeshot

[GregMember]

Good question Holeshot, I have seen the odd Doctor stop in a creek or at least run rough, the project bike did it to me once or twice when I took it away :ohmy: . That said which ever hoses are breathers I would just relocate then up the the space between the seat and airbox, not in to the airbox.
The remaining hoses are drain hose / hoses and I think they have to be able to go down to be able to drain, that gives two problems, one you dont want fuel in your airbox :silly: and second the airbox is above the carby and fuel cant drain up hill.
Not much help I am afraid sorry.

TB

[Nick AgainMember]

holeshot wrote:

Quote:

Hi guys,

Am thinking of feeding some of the vent hoses from the carby to the airbox to reduce the chance of filling the carby with water.

1/ Want to know if the bulls think it is a good idea or not for the DRZ400??
2/ If so, which ones do you run?.

I’m concerned, ( not so much if you drop it in a crossing its going to fill up anyway)but more so stopping halfway across with the vents underwater. It’s happened before with the bike coughing and spluttering nearly stalling.

Searching techeads
holeshot

Hey Holeshot…The lads in Nth Qld use DRZ400s’ for the FNQ run to the top and back. All their bikes have been water proofedby running thtem back up high but not to the Airbox. I’d sujest you have a Gook on their site. I seem to remember them having a tech Prep article on their page. Seeing as they “drain”..I’d have issues with running them to My airbox?

[DavidMember]

Hey Mate, with the ktm 65’s you extend the hoses and run them into the air box and when th bike is dropped they have ho dramas starting again the free flowing fuel really fuels the bike up and when you drop the thing the hoses are uphill and fuel can free flow, a little trick i have done for years with little riders that drop their bikes often

[GregMember]

Yeah Rat big difference between little 2 smoker and 400cc four stroker :laugh:

TB

[john pavkovicMember]

Thanks again guys,
I have looked up the Fair Dinkum Trailbike Tours page like Husky610 suggested and there is a great little article on waterproofing the Kehien FCR carbies. It works for WR’s KTM’s and the DRZ and only takes 15 mins. I would cut and paste the article but have no idea how to do it. I am sure that other Bulls can benefit from it.

busy venting
Holeshot

[Eric SmithMember]

Here is a direct link mate:

http://www.fairdinkumbiketours.com.au/techtips.html#1

[ChrisMember]

Good tips on that page, worth a read!

[Anonymous]

If you place them inside the airbox make sure they run across the top and point downwards. If your airbox is anything like mine it’s full of shit after a short muddy ride. Dirt/water/mud only needs to get into the hose and then it’s has an easy route to your carby which isn’t good.

[john pavkovicMember]

Jobs done,

There is a Tpiece on each side of the carby which have 2 vent hoses so i’ve turned the T piece vertical and fed the top hose into the airbox and the other left as is. Any excess fuel shuold flow down with no backcarge from the opposing hose hopefully. The bottom hose can be submergedand the carbie will breathe thru the top one i guess.

Took yor advise Moto and left the a wee bit longer in the airbox. This way i can keep a eye on it as i look in the box more than under the frame.

Bring on deep water

Holeshot

[john pavkovicMember]

Ballards actually have a kit for this very purpose with a little washable filter thats fixed in the airbox

[Anonymous]

I was going to suggest some sort of filter but thought it would too hard to find one for what it’s worth. All you need know is a pump installed in your boots to get all the water out

[Nick AgainMember]

Now to show off my great mechanicals skills and knowledge…Why does a Carby “breathe” through drain hoses? I just assumed the carby did all its Breathing through the throat….I have read about these hoses before and just assumed the drain. ..Now i got to go to the manual and read….

[DavidMember]

Its a very small amount of air equalizing as the level of fuel goes up and down, in theory the level should remain constant because the float will open the needle and seat as the fuel drops to let more in, its other function is, if there is a malfunction and the fuel does not stop flowing, the thing will run out and onto the ground..:lol: :silly: :blink:

[john pavkovicMember]

No pumps required just get in the missionary possi when no one is looking

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