My recent project is a 1994 R100 RT. While striping down the engine I found a steel pin in the oil pan. The pin is 3.5 mm in diameter and about 10.5 mm long.
The only pin I see on the parts diagram seems to be a pin for the con rod bearing.
Bike had a bad transmission but was running then I bought it last week. I will be putting in push rod tube seals so I'll get a look at the internals.
??? Thanks for your comments.