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Hello everyone. I have experience in small engine repair (mainly 4 stroke) on engines no older than 15 years old. I know how 2 stroke engines work too. I have recently obtained an old O&R engine, which seems to be in great shape. I do not know what the engine originally came off of, it also has no markings on it with a model number (or any number for that matter). One question I have is about the carburetor. Every carburetor picture I have seen on this forum has a red primer button, and a slotted jet on the top. Mine, however, has no primer button or a slotted adjustable jet on the top. Instead, there is a non-slotted knurled screw. I am also confused, because my unit does not seem to have any off switch, to stop the spark. Additionally, I am curious as to what the single point is for on an engine like this is for. On all the modern engines that I have worked on, there are no points. I have attached some pictures too for you to look at. By the way, I have not attempted to start it yet, as I am somewhat unsure of what fuel ratio it needs.