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Translate to "Emptying the base tube". Probably means drain the tube that runs from the bottom of the air filter that hang below the engine next to the fuel vent pipe.
 

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Discussion Starter · #3 ·
Translate to "Emptying the base tube". Probably means drain the tube that runs from the bottom of the air filter that hang below the engine next to the fuel vent pipe.
why and how should it be emptied? and what should it be emptied of?

if there is a chapter on it on the bmw workshop manual could you point me to it? i couldn't find it.
 

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I'm only guessing that's what it is. On the 650 gs there is a rubber tube that runs down from the air filter with a plug in the end. It's for draining any oil that collects in the air box from the crankcase breather.
 
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