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Hey I wanted to pick this thread up again to point out something lost with these wee filters. That is, the stock setup allows for a slight vacuum in the oil tank for the breather to pull from the engine crankcase. When you put one of these cone filters on, or something similar, the slight vacuum of the carbs disappears from the oil tank, and the crankcase isn't actively breathing. What do you guys think? Is my thinking and logic correct here? I wonder if these aftermarket breathers solve this problem, or you just have to do something similar to stock to re-introduce this hose from the oil tank to the air filters to re-establish this active breathing of the crankcase.