2009 Yamaha F40 Outboard Service Manual, Page 362Get this manual
General Periodic Maintenance
Adjusting the shift cable
1Remove the shift cable, and then adjust itSee "Installing the shift cable and throttle cable (remote control model)" (3-12)
Checking the spark plug
1Check the spark plugsSee "Checking the spark plug" (7-42)a b
Checking the timing belt
1Check the timing beltSee "Checking the timing belt and sprocket" (7-15)
To loosen the fitting, move the hook in direction To tighten the fitting, move the hook in direction b4Tighten the nuts a5Check the fitting againReplace the cowling seal if the free play cannot be adjusted