dogonfr wrote:
Sounds like the low speed circuit is clogged. If you have disassembled the carburetor cleaned and blown the circuits out and it still wont idle time for the Yamaha carb cleaner. If it still doesnt idle after the Yamaha cleaner then time to replace the carb. :)
http://www.boats.net/parts/detail/Maintenance/Y-ACC-
CARBC-LE-NR.html
yes its controlled by a Governor on the carb so it runs at a constant speed and doesn't bog down under load. some machines will have a throttle control which works the same way a car does. the more fuel the faster it runs the less fuel the slower it runs and its all controlled by valves in the carb.