Went for a 130m ride up into the Yorks Moors - just can't beat it on a day like today. Took around four hours to complete, but much of that was down tiny roads that revealed some more of the beauty of the British countryside. Only gripe is that irritating, occasional pop and bang which tends to happen more when it gets hot and accelerating. No misfires or problems at other times or when cruising - smooth as you like, even ticks over fine. Have tried opening throttle more slowly which helps. Also had problems kicking it up today, so had to bump twice?? Once going, all seems fine. Any suggestions? Points, plugs are fine as are the HT leads. Have cleaned the slip ring too. Drained the fuel tank and cleaned taps during lockdown. Carb was cleaned last year. Could be just a 'thing' but it's started relatively recently.