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I just serviced my burner last night and have been using the same nozzle and electrodes for years. I haven't done an efficiency test yet or verified pump pressure, but for some reason I wanted to check the flame shape and quality this time and I noticed that around the outside of the flame I could see droplets of fuel hitting the back of the combustion chamber. Is this normal? Nozzle is a Delavan .85x80B per the Burnham/riello combo kit install sheet. Any thoughts would be appreciated.