This is Kawasaki not Suzuki
This is a Kawasaki not a Suzuki, but it is worth re-posting. The Gen 1-3 Kawasaki have a breather in roughly the same place as the GSXR. My wet sump engines kept pumping oil out the breather, some engines more than others. After a particularly bad weekend I spent the time to study the internal breathing system.
Right below the external breather tube is a sealed chamber.
http://i43.photobucket.com/albums/e3...psuncogbex.jpgAfter removing this cover which is a challenge the way Kawasaki has glued it in place with there super rtv bond there is a chamber with 2 8mm inlet holes;
1 hole exits behind the flywheel in the clutch area.
2 hole runs through the case to the bottom of the oil pan and exits where it would be about 5mm above the bottom of the oil pan. This means it is always covered by the oil unless the engine is virtually out of oil.
http://i43.photobucket.com/albums/e3...pswpipy8et.jpg
http://i43.photobucket.com/albums/e3...pszctiwc6w.jpg
In order for this engine to push a quart of oil out of the external engine breather this chamber has to be completely full and the forces at work have to be overcoming the exit hole behind the flywheel. Now I do not claim to completely understand this however I figured this chamber needed more venting so I opened it up to the case around the transmission and the crankshaft.
http://i43.photobucket.com/albums/e3...pscgdv2tab.jpgThe result has been no oil in the catch tank and I was able to reduce the amount of oil in the engine by about 1/2 a quart.
My suggestion is crawl through the Suzuki engine and see if it needs some relief internally.
David