Yamaha 115-225 HP Outboards Service Manual, Page 57Get this manual
PE_R_IO_D_IC_S_E_R_VI_CE
4) Loosen the roller adjusting screw and then drive the screw so that the alignment mark on the throttle cam comes to the roller
Roller adjusting screw
CD Throttle cam Throttle roller
The roller adjusting screw is left handed