I have a Briggs and Stratton 5500W generator with the Briggs 342cc engine. The owner's manual calls for a .030 plug gap for plug. The factory plug is the Champion RC12YC. I purchased an iridium NGK BKR5EIX-11 plug to replace it. Out of the box the gap is .038 for the NGK. Should I reduce the gap to .030 or leave it at the .038? While it currently starts with ~2-4 pulls I'm hoping it will start quicker with the iridium plug. I had spinal cord surgery and living with reduced strength unfortunately. If a simple spark plug change aids in ease of starting I'll be happy. Otherwise I'll be no worse off .