SOHC.co.uk Forums > CB750

Breathers

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MICK CLARKE:
Its not necessary to connect the rear breather to the oil tank,the engine breathes from the rocker cover the rear crankcase vent is only used as an over spill for the oil tank and also in the case for the F1/F2 to allow the oil tank to breathe as its sealed by the O ring on the dip stick,unsure if the K series bikes oil cap seals the tank or not.
Cant see any reason why you cant just cap the rear one and run a small K&N type filter on the rocker cover one or go old school Triumph and run an open vent pipe along the frame and exit at the ass end of the bike

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