Trying to get a portable welder running my mom give me in my late fathers will. It runs but seems to be real rich running. Took the carb. apart and looks like she needs a little cleaning. The needle is steel and i am not sure about the seat? The gaskets all look good, but not sure what else I should look for. Farmers told me to put a little seafoam in it when I start her up? It is a Model NO.Ac-225/Dc-210/6. Code # 8810 Briggs and Stratton 531 cc 16hp. Little help would be much appreciated. Thank you.