I am guessing at some things cause you didn't post your full model number off the port bracket.
sure sounds like you have a gummed up carb. did you stabilize the fuel and run it through the engine prior to letting the motor sit all those months?
please provide a little history.
the fuel strainer, part #5
http://www.boats.net/parts/search/Ya...201/parts.html
to clean the carbs, take off the float chamber #2, and clean up inside there including the needle valve, main and pilot jets. I use CRC 0604 or tech 2000 from walmart, use safty glasses and skin protection.
http://www.boats.net/parts/search/Ya...TOR/parts.html
if you don't run the motor on a regular basis, add stabilizer to the fuel, either startron or stabil(the Marine/E10 formula)