i block off the rear breather pipe from the tappet cover completely even removing the fitting that you clamp onto and replace it with the alloy nut that holds the engine oil prescreen its the same thread you need to die grind some of the cover to fit it, the rear breather gets holed easily and when they start to perish the oil throwing up directly from the cam chain bust out and oil goes everywhere, when i fit the alloy nut i cut the rear breather tube off about 2 inches from the end and push a rubber plug up inside to seal it. an easier way is take of the back breather push a plug up it and clamp it back on but i prefer to get rid of it completely as on a 650 its too close to the fuel tank and rubs through. I run Omero alloy tanks and they are designed for a 450 so you need a hammer to dent the alloy in that area to clear on a 650
I also take the black foam out of the front breather and cut and reshape a slightly more dense foam, the foam i use is what comes with alloy bashguards to stop engine noise resinating on the alloy its supplied free by some manufacturers here in Australia.
On my first 550 05 when i flooded it with oil i would start the engine with the choke on and leave it on for about 30 seconds at quarter throttle the extra fuel cleaned the oil out quicker, then i did the mods and all my other bikes.
dont have a problem.
Mind you 30 seconds is a long time when every body with a jap bike in the pits is looking, pointing and laughing at the smoking Berg, there smiles soon dissappear when you clear it out on the start line and beat them to the first corner by 5 bike lenghts hurling debris all over them.
ORANGEBERG