Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 371Get this manual
-4.Set the control lever the throttle full open position-5.Loosen the lock nut on the link joint bracket, and adjust by turning the stopper bolt to bring the carburetor to full openLINK JOINT BRACKET STOPPER BOLT
5OPTIONAL EQUIPMENT
RADIO SYSTEM INSTALLATION PRECAUTION
NOTE: Radio wave is strong that it may damage the outboard motorCarefully follow the installation instructionKeep the antenna and the radio unit at least 50 cm (1.6 ft) away from the outboard motor, control cable and remote control boxDo not install the antenna cord and control cable tied upSelect radio with its output power less than 10 W