My neighbor rolled his riding mower out of his shed after 3 years. UGLY!!! It is a Power Pro P.O.S. 12 hp B&S with a Walbro carb Among other things the carb was a mess. Cleaned it , put it back on the mower and it started right up. and I had no throttle control. All linkage in place , springs etc.. adjusted the jet out 1 1/2 ,( the way I found it ) throttle plate is closed, and the gov rod has tension pushing it closed. Am I missing something or is my neighbor buying a new carb? Does anybody out there have any ideas. Please help.