I am hoping someone can offer some information on how to repair my Honda Walk Behind Lawn Mower. I just recently acquired a Honda HRB216TDA 5.5 hp Honda lawn mower. It has not been in storage (with the fuel still in it) over ten years. Prior to that, it was used about three times. I have already replaced the spark plug, carburetor, gaskets and changed the oil. It starts up fine but never reaches full throttle. As it continues to run, the engine looses power. It always sounds like it getting ready to stop running. It seems that there isn't a difference in engine performance when the throttle lever is in the Choke position or Full Throttle position. Either way it sounds like it is going to die. Any suggestions on what to do? Any help is greatly appreciated.