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It's a part of the emissions control and in theory allows oil droplets to condense out and drop back into the motor and vapour to pass into the air box and so be burnt as the engine runs.
On my last two 750's I removed it and replaced it with a little filter (one of the small cone types). You do need this to be positioned so that if the engine decides to start spitting out oil it doesn't end up on the back wheel.
I'll probably do the same on my S2R.
Removing this also fixes the oil emulsion problebd (the white mayonnaise) that you often get in damp weather as the catch box also allows water vapour to condense out and droop back into the motor.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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