Chainsaw Repair

The vent you are talking about just connects to inside the air filter. Normally there is just a hole in the carburetor cover for this function.

If the regulator diaphragm vent hole gets plugged, the engine will stop. A rotor tiller works in such a dusty environment at times, this was added for reliability. Some Stihl chainsaws have this.

Thanks.  What would be the downside from strictly a performance point of view (not durability) if the same shape of C1Q but without the plastic vent nipple was bolted up to my engine?  Or maybe it wouldn't even fit at all?  Just curious in case the aftermarket knock-off doesn't work.