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it seems to be getting too much oil to burn either the solonied is not shutting or the needle valve on oil pump is faulty or sticking its a fairly new burner probably 18 months old this behavior started very suddenly according to the owner
Riello burners and pumps do things differently than say their Danfoss cousins. When the solenoid de-energises the stem opens up a port. If the pump is letting by its the regulating spool and not the stem.
Check two things.
1. Do you have a wash pressure and whats operating pressure?
2. If spool is letting by, before bringing on for ignition check inside chamber refractory base and blast tube for signs of oil drip over night, or between demands.
If spool is letting by then you will get large plumes of smoke. You could also have a duff nozzle, bad oil batch or even traces of water could cause it.
Attached is a basic diagram of Riello pumps for your own benefit.