Is it common for a 3.5 Briggs & Stratton to run w/o a carb's welch plug? The plug that is missing will let you see 2-3 very small holes with daylight just inside the choke plate to carb area. It appears there was a plug in place at one time due to lack of paint and no grime. The engine seems to run ok even though you have the machined air metering holes behind where the plug once was. Since my small engine work (since 1970) I h/n seen a plug missing or replaced one. I feel I have seen the plugs in 2-cycle carb kits vs 4-cycles. Please share your experiences with welch plug missing or welch plugs period on old Briggs engines.

Engine's Specs: B&S 3.5, Model # 90702, Type 305801, Code 8733002

Thanks! loger