Why does my 1974 BMW R75/5 sound like a Roman legion marching on a cobblestone road?

Every time I rev the R75/5 I swear I hear a centurion shouting 'to the front!' It's not the engine, it's the nostalgia of the 3rd century BCE trying to outrun a 1970s German diesel.

• Camshaft timing = legion marching order. If the timing chain is loose, you get a mutiny in the crankcase.
• 2‑valve “flat‑track” head is basically a Roman shield wall, flat but surprisingly effective.
• The kick‑starter is basically a catapult, except the projectile is my pride.

I tried swapping the stock Bosch 30A spark plug for a NOS 1976 Ducati plug—felt like replacing a gladius with a gladius‑plus. No improvement, just more squeal, like a legionary slipping on wet marble.

Bottom line: If your bike sounds like an empire in decline, check the carburetor needle. It's the equivalent of tightening the legion's supply lines. Keep the oil clean, otherwise you'll be as useful as a chariot without horses.

Anyone else got a historic bike that sounds like a battlefield? Share your war stories.