Looking in my literature collection I have an owners manual for the A15 dated June 1986.
146cc; 3.2 hp @3400 rpm. spark plug Champion RN12YC or RN14Y gap .030in or 0.76mm. Oil grade SAE20W50 for temperatures above 16F.
The E in the engine number indicates electronic ignition. Meetens should be able to supply any parts there are other suppliers as well.