Small Engines (Lawn Mowers, etc.): snow blower over revving, snow blower, carburetor

Question
Hello--I have a craftsman 5HP 21"snow blower. Tecumseh HSK850-8330C engine carb #640088 from the craftsman manual. It is 8years old. Have used stabilizer in gas since new.
Starts first pull every time. Runs good for awhile then starts over revving. It will not stop by turning off key, have to use full choke and push into snow. Start it again and it runs good for a few minutes then over revs again. Cannot turn off with key again, have to use full choke and push into snow. Hope you can come up with a solution. Thank you in advance of answer.

John

Answer
John
I suspect problem is either the combination of carburetor and governor settings or perhaps valves.

Problem could be governor related as well. I scanned my manual for the governor and carb linkage.

also check your spark while your at it to see what kind of spark your getting. tecumsehs are picky engines and they'll pretty much bicker and act up if something isn't exactly right