Since I first got my 05 BA, It had that little Harley trait, little drop of oil. Mine was on the cyl. fins, just below the head.
It was under warranty, so I let the dealer deal with it.
He kept thinking it was a bad seal at the Breather tube to head.
Well, it was. But it wasn't due to a bad O-ring, it was a bad head casting, where the surface machining had a bad imperfection due to missing material from the casting.
Thank God it was under warranty, as my dealer said the head and related parts was almost $1,500.00, and the labor bill was almost $1,000.00.
Sounds like Triumph needs to improve their heads, or maybe our two problems are rare?