Even without numbers a couple of things come to mind quickly. First check your oil level and also smell it. If it smells like gas and is over the full mark, you have a problem with your carb. If it is at the full mark and no smell, we can mark that off as a problem. Has this just shown up recently or slowly getting worse? May be just a slow accumulation of dirt. There are numbers on the shroud, so start wiping and report back when you find them.
You Have a 3.5 HP engine ..... Some of the best ones that they don't make anymore......... Yep that's gas and dirt on there....
Also that lil L shaped boot from the carb to the vent tube is cracked more than likely ........ I keep those in stock in my big shop and my small shop at my house ..........
The diaphragm kits for those are cheap also ...... If even one or two of those phillips screws are loose it will leak gas and cause that also......... Also it will run bad if it's leaking air ............
Those engines are cheap to rebuild and get another 10 years out of them ~!~!
Plus Tard Mon Ami ~!~!
Clean the area where the dipstick tube enters the block. Not uncommon for this seal and/or gasket to become brittle and leak.