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Peter! "Bagster Harness and tank Bag" tell us more....
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every time in the rain, (and always riding out with a tankbag)My experience with tank bags on a Comet is when securely mounted - the bike is a no-go. Base of the bag seals the fuel cap breather and starves the motor of fuel.
A good way to test this theory, or to test the tank bag fuel starvation phenomenon, disconnect the carburettor float bowl fuel feed with the fuel turned off, put your finger firmly over the fuel cap vent hole, turn the fuel on and wait, if no fuel flows you have a perfect vacuum. Would drilling a similar size hole to the vent hole just a knats down from the top radius/corner of the cap solve the vacuum problem without creating a petrol leak problem? I won't be experimenting as I have never experienced this problem, but if you would like to use a tank bag, and lets face it, it is the best way to carry easy to get to items, specs, phone, wallet etc, unless that is like me you forget to zip up the top clear view compartment, as I did riding back from the West Bay Meet a few years ago and lost an iPhone!If I remember correctly you don´t need a cap with a hole in the chromed top at all. The spring loaded steel insert inside that presses on the rubber seal got a hole of course. BUT this insert is movable and does not seal to the chrome top - so any air from within the tank can exit to free air around the insert to escape from under the chrome cover down the tank filler neck. A tank bag cannot block this - except it seals perfectly all around the neck.