I had issues with my key sticking in the cap and refusing to come out. Replaced the cap with an ebay screw-off type. No problems so far, unless you count the black anodized finish not holding up to the sun. (It's sort of bronze now.) Actually heard it vent the other day. Left the bike outside in the heat while I was at work. When I got home and started to move it into the garage, I heard it vent a couple times. Never noticed it before, but probably because it's usually in the garage or else I'm starting it right up and the engine noise obscures the venting noise.