Small Engines (Lawn Mowers, etc.): mower engines dies upon throttle up, motor tecumseh, question pool

Question
My lawn tractor motor (Tecumseh OHV135) starts and idles good, but when I try to push the throttle to full run power it will not run up and just backfires etc. and dies. It is not the choke or linkage everything appears to be moving freely. Cleaned the carb and bowl. It was doing fine until just recently. Engine is 4 years old, well mantained,has a "C" (250hrs normal life) on data plate. Could it be valves, valve adjustment, governor,  low compression, blocked intake or exaust ports, rings etc? I have had tired old motors lose power with age but would still go to full throttle. I am puzzled?

Answer
Hello Travis:

Sorry for the Delay. This Question was Located in the Question Pool. Send me the Model and Type or SPEC Numbers Off the Engine, Please. With these I can Locate the Proper Manual and Better Assist you. Thanks.

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John