I've been running big singles for the past 40+ years. All high milers. 20 years on Enfields, never had any serious trouble. Always looked after the oil changes, but learned that there is no such thing as a maintenance schedule on Enfields, more like a rolling maintenance ritual. I just got rid of my beloved 350 iron barrel which was, apart from being dangerously slow, the smoothest sweetest handling bike I have owned to date. So I've now got an army green uce. The engine doesn't look to be as spanner friendly as the older ones, but then I might not need to use said panniers so often. Done a few thousand miles now with no problems, done the battery terminals and drilled out the pop rivets on that wire guard on the exhaust heatshield. I tacked on 5mm captive nuts and re-attatched it with some nice dome headed Allen screws. Love the bike, nearly as smooth as the old 350, and you don't need to play tunes on the gearbox when hills appear. I've no plans to modify, just want to pile on the miles and enjoy life. Oh, and as far as reliability goes on the older bikes, the first 350 I owned I put nearly 86 thousand miles on the clock, and 1roadside breakdown (clutch cable).