I'm thinking of "T"ing them both, and running them into the little K&N style filter.
The one hose is 7.5mm and the other is 10mm. The inner diameter of the little K&N style filter, is 7.5mm, too.
Hmmmm....Maybe someone else can jump here? I can't remember exactly where that vacuum chamber vent hose goes to, but I think it's to the carb
to allow air in when the CV slide moves up via vacuum.....the OTHER side of the diaphram. So, I don't think you want oil from the crankcase getting potentially pulled in there. Might want to keep 'em separate.
I'll look at mine a bit later and check back here this evening.