2009 Yamaha F40 Outboard Service Manual, Page 354Get this manual
Predelivery check 2Check that the throttle operates smoothly when the throttle grip is turned from the fully closed position to the fully open position (tiller handle model)Check that the throttle operates smoothly when the remote control lever is shifted from the or position to the fully open positions (remote control model)3Check that there is no interference with wires or hoses when steering the tiltedup outboard motor4Check that the trim meter points down when the outboard motor is tilted all the way down (remote control model) 0 9
Checking the steering system
1Check the steering friction for proper adjustmentSee "Installing the tiller handle" (3-10) step 16 and step 172Check that smoothlythe steering operates
Checking the outboard motor mounting height
1Check that the anti-cavitation plate is aligned with the bottom of the boat bIf the mounting height is too high, cavitation will occur and propulsion will be reducedBesides, the engine speed will increase abnormally and cause the engine to overheatIf the mounting height is too low, water resistance will increase and reduce engine efficiency and performance