The big risk with a partial fuel flow reduction on a bmw is it will make your engine run lean, and then at high throttle openings you have a high likleyhood of melting pistons.
It is easier to clean carbs.
bmw fuel flow is barely sufficient when it is fine so cant really accept any degradation. Better to fuel up regularly so you dont use the trash that gets released when you switch to reserve.
As to the argument, it worked fine in my bike.. well it is perfectly possible to cross the road without looking. and no one here who was hit by a bus will report the accident. That does not make it the preferred method. Be wise and choose the option which 'fails safe'.
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