From my memory the four carb overflow pipes are routed between the engine and the rear swing arm where they dangle down with an inch or so where the pipes end.
There is a vent pipe on the bottom of the air filter housing plus a vent on the black intake box between the carbs & the air filter.
I assume these two pipes terminate at the clip on the centre stand clamp area passing through the gap between the engine casing & the swing arm?
My crankcase pipe was cut off so not sure where that goes / ends up, likewise where does the battery vent pipe terminate as mine was missing?