Small Engine Troubleshooting Problems? Ask a Mechanic Now.
This is a carburetor problem and here is what need to happen
remove the carb.....diagram the linkage
disassemble the carb and diagram the internals
soak the parts and carb body in NAPA COMMERCIAL STRENGTH CLEANER OVERNIGHT
reassemble using your diagrams with a carb kit from the local dealer
use it to you hearts content