Need clarification on Newer Gen Monster Hose

[EEL]

So I screwed up my old airbox. Got a used replacement one off ebay. The guy I bought it from was a salvaged dealer and basically ripped it out without any thought. Upon inspection today I noticed that in his haste, he snapped a fitting off the airbox that connects a hose. Looking at it, I dont know if its that relevant. I'm wondering If I can just epoxy seal the hole and move on.

Questions I need answered:

1) What is the purpose of this hose
2) Why cant I get rid of it.

My assumptions of what I might be for (could be completely wrong):

It almost seems like its like a blowoff hose associated with possible accidental overpressurizaton of the airbox while the bike is running. I'm installing an MWR Power up Kit so I dont think I will have any issues with overpressurization since I have large holes directly in the airbox.

Picture below: The parts catalog calls it a "breather hose" but its pinched at the bottom to prevent an air leak.



Completely necessary? If so explain...

[Dirty Duc]

It looks like a water drain to me.  Only strictly necessary if you ever get caught in the rain or in a place with high humidity...

[EEL]

That's good news!

And even more good news! (kind of). The hose nipple connection that was shapped off was rustling round in the box. I should be able to epoxy it back into place.

[Dirty Duc]

That's good news!

And even more good news! (kind of). The hose nipple connection that was shapped off was rustling round in the box. I should be able to epoxy it back into place.

Well, kind of.  I wouldn't run a stock airbox without it... worst case scenario is you suck a load of water into the cylinder because it has pooled in the airbox.  But epoxying the connector back in is a good solution.

[EEL]

My bike isn't going to be a garage queen but I dont generally ride it in the rain unless I'm accidentally caught in storm. Too much cleanup afterwards. 

[Dirty Duc]

I think the design purpose of that hose is to drain the water out after getting accidentally caught in the rain.  Air does weird stuff when traveling into intake manifolds and such.

Pod filters and similar don't need it because there isn't a place for the water to pool.

[Howie]

I think the design purpose of that hose is to drain the water out after getting accidentally caught in the rain.  Air does weird stuff when traveling into intake manifolds and such.

Pod filters and similar don't need it because there isn't a place for the water to pool.

Yep.  The hose allows water to escape without letting unfiltered air in.  Epoxy it.

[oldndumb]

My bike isn't going to be a garage queen but I dont generally ride it in the rain unless I'm accidentally caught in storm. Too much cleanup afterwards.  

All of the recommendations to reinstall the fitting and hose are spot on, especially when considering that the MWR kit enhances the ability for the engine to ingest water directly into the air box.

I have a MWR clone installed on my bike and will never ride in the rain because of it. If I inadvertently get caught in a shower, I stop and wait it out.

EEL, not trying for a thread high jack, and I don't know if you have already addressed this, but you will need a remap after installing the MWR kit.

[jduke]

It's used to let any fluid in the air box drain out, water or oil.
The EPA plumbing for the crankcase breathing system has a hose running to the airbox. If you're blowing oil out the crankcase it could pool in the airbox.
If you're going to keep the stock airbox, I would epoxy it.

[EEL]

All of the recommendations to reinstall the fitting and hose are spot on, especially when considering that the MWR kit enhances the ability for the engine to ingest water directly into the air box.

I have a MWR clone installed on my bike and will never ride in the rain because of it. If I inadvertently get caught in a shower, I stop and wait it out.

EEL, not trying for a thread high jack, and I don't know if you have already addressed this, but you will need a remap after installing the MWR kit.

ECU already mapped w/ O2 and flapper removed. Power Commander already installed. I finished up the valves and belts a month ago but been working back to a full bike slowly on weekends as time allows.

Autotune will go in once I get the exhaust reinstalled. I've already got one in the box waiting in the garage. Hoping this bike will come together by end of March. I'm curious how my new SC Project GP-M2 will sound.

[oldndumb]

ECU already mapped w/ O2 and flapper removed. Power Commander already installed. I finished up the valves and belts a month ago but been working back to a full bike slowly on weekends as time allows.

Autotune will go in once I get the exhaust reinstalled. I've already got one the box in the garage. Hoping this bike will come together by end of march.

Disabling the flapper has negligible effect considering its range of operation. I removed mine because it was fuggly

If the remap was the Ducati Performance map, once you install the AutoTune and select an AFR range around 13.2, you will most likely find that the MWR flows more air than the Ducati Performance filter.

[EEL]

I hybridized mine with a more dense green unifilter. Since its more exposed to weather I figured I'd err on the side of caution.Air flow might be reduced a bit but it will still be more than just the K&N. The stock one looked just too porus to me.

Going to start with Ungeheurer's "KISS" matrix for AFR and going to work from there if necessary.