Asking all who know there honda cams

I just took the valve cover off my xl600 today to look for reasons why I get a pre ignition knock, still going to pull the head and look around,I run 125's in both carbs so I don't think it's that.

Anyway, the cam looks good no score marks or anything,but I thought stock cams would have a number like MG2-020 or something like that, but mine has R5 on it. So I ask the masses, anyone know what this thing is?

Many thanks

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