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I have a Tvs100-44015b 3.5HP Tecumseh engine that I completely rebuilt last year. New crankcase and piston, valves,etc. Really runs great when warm but having trouble keeping it running when starting cold. I have to keep pumping the primer to keep it running. I am suspect of the cheap carb I bought on Amazon. I think I have seen other posts where people have advised against the cheap China carbs. I found the original number is 632098. Any advice on where to buy good replacement?

Any good repair shop should be able to help you out.