Stihl 020avp, where is the oil tank vent on one??

[alexcagle]

I looked at media cat, but I dont see an oil tank vent listed in the crankcase or the filler cap.
My filler cap is oem, but solid with no duck bill or ball check with spring.
Mine is a TS202 and came sans oiler, but has a 1/4" chainsaw sprocket (odd).
Anybody know where it should be, or is it one of those cheesy cotter pins?

 

[a. palmer jr.]

are you sure it's not a little groove in the cap under the gasket? I've seen a few that way.

 

[alexcagle]

This one doesn't have the groove.
I think I'll just use an 015 cap that's vented.
I think someone stuck this cap on this saw from another saw.