Snapped a couple of photos of the relevant items.
I've been running Iridium spark plugs for more than 30,000 km now. Extraordinary durability. Inspected and NO re-gapping required. And a perfect clean burn

NGK Iridium Spark Plugs: 32,000 km of service. The plug gap is still spot-on at 0.8mm.

How old do you think this engine is?

Valve assembly at 182,000 kilometres (113,000 miles) - Took this photo while checking the valve clearances. Incredibly clean. With good maintenance, these BMW Boxer Engines are pretty awesome!
Gotta love these engines... and bikes

I remember back in the day

