Honda CB750 CB900 CB1100 CBX DOHC Mystery Cylinder Head Plug

There is a somewhat mysterious plug on the cylinder head that begins to leak oil. I explain why I find it mysterious and demonstrate a quick repair. Parts fiches at CMSNL: https://www.cmsnl.com/honda-cb750f-75... The plug itself is Honda part no. 91208-422-003 Here's a tip when you're looking for an obscure part: try Googling with and without the dashes. In my experience, more/different links come up, especially as regards eBay listings. CB750 DOHC Scheduled Maintenance:    • 1980 Honda CB750F DOHC Scheduled Maintenan...   Guma tee: http://guma.bandcamp.com/merch https://gumaverse.com