Mercury Force 9.9, 15HP Outboards Service Manual, Page 32Get this manual
9Remove throttle shaft (A) and throttle shaft return spring (B) from carburetor Note position of spring AS REQUIRED
10Remove welch plug Drill hole through welch plug (C)r
IMPORTANT Do not drill into carburetor body Insert small screwd river tip into hole and pry welch pl ug from housing
11 Inspect:
INSPECT Idle Mixture Screw Inlet Needle Idle Spring Inlet Elbow Body Jet Nozzle Need le Valve Seat