2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 273Get this manual
TRBL SHTG
Troubleshooting
Troubleshooting the lower unit
Symptom 1: Shift mechanism of the forward gear and reverse gear does not operate properly Symptom Cause Throttle open (tiller handle model) Cause Checking step Turn the throttle cam to the fully closed position(Tiller handle model) Check and adjust the shift cable and shift cable joint(Remote control model) Check the remote control box(Remote control model) Check the shift linkCheck the shift rod camCheck the connection of the shift rodAdjust the shift rodDisassemble and check the lower unitRefer to page 3-7