carb breather hoses query mk1

[robw]

I have worked out the postions of the carb breather hoses, float bowl hose and their associated brackets on the carb. However, I have noticed in the Haynes manual another pipe that is on the right hand side which goes over the oil feed pipe and goes through a bracket that is attached to the front right carb bowl screw. Where does this pipe come from?
Rob

[wonkywheel]

Any help?
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[robw]

It is. Many thanks Rob