Taper, if any on the vintage Saito 30 is not enough for concern. The cam in that engine was replaced fairly early on, around 1982. Yep, the fitting on the cam box is the vent.
My first Saito and my first four stroke. A good learning tool.
Heatwave here, north of Canada today, 4°F (-15.5°C) No big deal, cold happens.
