I saw a feature on a teardown of a Ural bike engine that had broken down. Once they pulled the crankcase apart, it was rotten with swarf. This was a modern build from the 2000s.Indeed.
Must run in extreme cold, extreme heat, easy to fix, and with a life expectancy of days/weeks.
I'm sure @Smeggers will be well aware of this as he assembles the beast - it cannot be 'perfect' as none of them WERE perfect ex factory!
IIRC, at the first oil change at 100kms, they'd expect to find a kilo or so of swarf in the filters.