2009 Yamaha F40 Outboard Service Manual, Page 353Get this manual
Maintenance 2Remove the check screw a, and then check the gear oil level in the lower case
3Check that the engine turns off when the clip is pulled from the engine shut-off switchCheck that the engine turns off when the engine shut-off switch is pushed (tiller handle model)
If the oil is at the correct level, small amount of oil should overflow out of the check hole when the gear oil check screw is removed3Install new gasket and the check screw a, and then tighten the check screw to the specified torqueCheck screw a: Nm (0.9 kgfm, 6.6 ftlb)
Checking the gear shift and throttle operationDo not overtighten the friction adjusterIf there is too much resistance, it could be difficult to move the remote control lever or the throttle grip, which could result in an accident1Check that the gear shift operates smoothly when the shift lever is shifted from the to the or position (tiller handle model)Check that the gear shift operates smoothly when the remote control lever is shifted from the to the or position (remote control model)