Ducati Monster Forum

I now have this issue to deal with after installing a 999 shock with a remote reservoir on my S2R800.

I have done a search and read many threads on the issue and it seems the TPO option is the only real way to go at present. Using the old expansion tank is not an option. The TPO kit has its fans and those who use it without problem and also has its detractors.

There were some comments from members who were looking into alternative expansion tanks or other options. I just want to know if anyone has another solution to the problem before I go out and buy something.

At present, my solution was to buy a plastic hose connector and simply join the pipes together that run from the crank case to the airbox. I haven't been able to test ride it yet but I doubt my airbox will end up with much oil in it, if any.

When I removed the old expansion tank, all it had in it was a few drops of water, probably from the last wash I gave the bike.

So, has our combined research into this field developed any further?

As long as you aren't doing exesively long wheelies, the tube should be fine.

Make sure you don't get rid of the reed valve in the breather.  There are "race" breathers that are made without the valve but that is for use with a remote valve.  Other than that, your solution is a good one if you are happy with it.  I've seen people run a hose up to a small filter under the seat - somewhere convenient using the hose to catch and return any escaping oil and plugging the airbox fitting.  The TPO kit is what I used.  It is basically a K&N filter so you are paying TPO to figure out the right one for you - they also give you some plastic plugs to seal up the airbox hole.  I don't do a lot of wheelies, none really and my breather filter is still drip/mist free after almost three years.

I went with a "bling" breather attachment (with reed valve) and an off the shelf filter element. No oil mist (but no wheelies either)

On my old 900ss I just went with the stock one, cut the hose to about 5 inches long and again attached an off the self filter. Some oil mist in this case.

So in general I'd recommend an aftermarket breather with reed (unless you like cleaning off oil mist)

I had an L shaped plastic connector and joined the hoses like you suggest and my Monster ran fine.  I could not find a connector with the correct diameters, so it was a hybrid joined with JB Weld.

Now I just run one large diameter hose from the breather housing to the back under the beertray.  I use a marine plug to close the airbox and a marine one way valve at the end of the long hose.

Your engine may differ, but I can see through the clear hose and I have not noticed condensed oil inside, mostly (if anything) water droplets early in the ride.

I've not had any issues with my K&N filter mounted directly on the breather.  That said, I don't know how to wheelie.

Perhaps a couple of inches of tubing to raise the filter up a bit would help?

I did the k&n and had misting bad on the highway. Talking with Stu and his suggestion I raised the filter,about 4", now it's under the tank and all good.

I have been using this since 2005, no problems to report..!!
Just a short L shape pipe out of the breather to the small filter that comes out on one side of the bike.

(http://farm3.static.flickr.com/2187/2484320857_7e6ac5704e_b.jpg)

All my wheelies are accidental ones. I think I will be OK with the direct connection hose. If I end up with an airbox full of oil, I'll rethink the idea and go for a filter on a length of tube.

The general consensus seems that we haven't advanced research in the field, mainly because the TPO filter seems to work for most people.

Seach and ye shall receive...

http://ducatimonsterforum.org/index.php?topic=6652.0 (http://ducatimonsterforum.org/index.php?topic=6652.0)

I've casually been on the lookout for something to easily replace the tank so I could invert the rectifier and give it more cooling air.

I've only found a few pre-made pieces that were nice enough that I'd consider it.  I've been toying with using one of those spun aluminum water bottles and grafting some hose barbs onto it.  But it's a pretty low priority on my project list.

On my old Yamaha twin I used a "Power Brake Check Valve"  for old GMCs.  It can be found in the "Help!" section of most auto parts stores.  It is a one way valve that will vent air out but not let any back in. 

(http://img.photobucket.com/albums/v92/2-Skinny/BR0832_L1_Main.jpg)

Using this piece, you can use a length of hose and vent to atmosphere and it is supposed to be better for the bike because I don't believe the back and forth vacuum effect of crank case pressure is good for the engine at high RPMs...can't remember why though.