1981 RS Been reading a lot of threads about the gas cap not venting but haven't found one that says what to do about it. I was riding yesterday and a couple timed while cruising at 3000rpm the bike started acting like it was running out of gas. This has been only one of the issues with the bike and I've addressed all the fuel and ignition issues. Complete new ignition, rebuilt Bings etc etc etc. So, I tried unscrewing the gas cap while cruising along and it cured the problem, several times in fact. So how do I fix the gas cap? Replace it? I'm certain this is the issue. I noticed pressure build up when I had stopped for gas at the pump when releasing the cap like on a car. I wonder if this ay be some of the reason I get a lot of popping when down shifting...?