On the CB500F its a control valve on the relay tray and two reed valves on the corners of the valve cover, smaller than a matchbox and not much heavier.By the time you got under the tank and that far I wouldn't view them as any huge challenge. Sealing the corners of the valve cover looks the hardest bit. i was thinking the CBF would be similar.
Now on the Bonneville the tubes stopped you getting at the spark plugs so worth removing, but easy to seal with drainplug style bolts and washers.
Andy
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