Thank you for the parts guide, saved me some time. It has your engine and numbers in it so you don't have to go looking for them. Yes, you have a gravity feel system. I would like you to do one more test before sticking money into it. This might also need a helper, because time will be a premium. First, remove the fuel line from the carb and drain some into a container. Notice how fast it runs, as it should flow very fast. Second, reattach the fuel line to the carb, but do not install the clamp. Third, start the engine and run until it stalls out. Immediately remove the fuel line from the carb and notice the rate of flow. If it is the same as before we can now assume that you have a problem in the carb. If the rate of flow is slower, then we have to check for a restriction in the fuel line. If you have a good steady flow each time, I would recommend rebuilding the carb. Just my opinion, take it for what it's worth.