it says crankcase drain (tube) so it must do something like the purge valves on older cd ad qd series of motors
sends unsued fuel oil mix from the crankcase down and out the exhaust route… At idle fuel oil vapours don’t make it all to the cylinders for combustion and accumulates in the cc so it gets pushed out on the next down stroke crankcase build up of pressure.
I would not replace a tube with a brass rod piece
or something else 🙂
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