Here is my problem and why I asked for this manual. I have a 5hp Craftsman snowblower with engine 143.025001. I converted this number to Tecumseh # HSSK50-67410S. What I think is carb 640084A on it. The carb itself has 5145-H1S stamped on it. This machine starts, okay and runs ok except when under load. In other words our first snow of about 4 inches I could not run at full speed without the machine bogging way down and almost die. I have to run the machine on the slowest speed so it wont die. Like I said runs idles fine just when under a "load" I have troubles. Last year took off and clean with just carb cleaner and cleaned holes on bowl screw. This maybe helped some. I have a carb kit but have not installed yet. Are my troubles in the carb? May as well put in the kit? Can someone email me the carb manual 695907? I like this web site/forum.
It sounds like the problem may lie in your carburetor. I don't have the carburetor manual, but you should be able to find enough information about your carburetor from the engine service manual. They are available in the sticky thread located at the top of this 4 cycle section.