Yes, I admit as a teenager, (its a steep learning curve), I did inflict some damage on both my BSA's & not always by falling off them, but I also improved some things too, better headlight H4, brighter "Stanley" tail bulb, uprated switchgear, re-wiring, allen bolts, milled down, (by uncle) A50 engine sprocket with more teeth to cruise easier on motorways, but there was not much you could do, reverse the cam plate for 1 up & 3 down, faster gear changes, Hammerite on cycle parts, gaskets from CCM, megaphone silencer, sounded like the "End of the World" when on full throttle! Although this improvement didn't always go down well the neighbours & local Constabulary, my Dad used to hear me on a Summers eve' coming down the box when negotiating the round-a-bout from the M61 to the A6, he was half a mile away and knew the distinctive noise of the engine!
At the time you innocently do not realise what fun you were having compared to the totalitarian conditions we ride into today, as the country descends into an abyss, full of uptight, target setting arse-holes who make policy & install CCTV everywhere, when probably the most fun they ever experienced was when the passed "wind" on their fifth birthday, the word "Free Country" seems to stick in my throat!
As the Gaul Brennus declared to the Romans "vie victus!, woe to the defeated, @ the moment the plutocrats & bureaucrats seem to have it all their way, who's defending motorcyclists rights? The BMF, MAG its a sorry state of affairs, the next step will be it will be illegal to do your home maintenance, you'll see, but on this I hope I am not right.
Cheers
JBW