The plastic ring sitting on top of the engine cover is part of the fuel tank which you need to get back far enough to get the engine cover off. Take out the 3 small bolts on the inner ring ( pic 3 ) and there is a bolt lower on the side of the fuel tank to take out and shift the tank back out of the way. Remove the 1 small bolt holding the dipstick tube to the cover and twist dip stick out of the way. Remove the engine cover and rewind spring as per any Briggs with that style pull start.
