SOHC.co.uk Forums > CB350/400

Where does the cam top cover vent pipe connec to?

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Rozabikes Tim:
Back in the day the racing lads used to feed it into a coke can or similar cable tied to the frame.
That would mess with your lovely restored bike's look.😱

florence:
certainly, earlier bikes, such as my 350K, had the tube going to the atmosphere and never presented a problem.

McCabe-Thiele (Ted):
One of the things that actually worked was when the BL A series engine introduced positive crank case ventilation with the oil precipitator on the push rod side case and a vacuum operated valve that vented into the air cleaner box. It seemed to prevent the build up of black sludge in the oil - that was probably mainly fixed by better multi grade mineral oils.

I have no idea if modern motor cycle engines use such devices.

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