Why? Could you explain.
There is a rubber plug on the front, top RHS of the engine, where a decompressor lever used to be on earlier models. It has been known for this rubber bung to 'blow out' and spew oil everywhere. You can replace it with aftermarket plugs, or you can take the cheap arse option like I did. I just used a small piece of aluminium angle and used the existing bolt to hold it in place. See the pic in the link below and it should make it a bit clearer for you.
cheap arse bung fix