2009 Yamaha F40 Outboard Service Manual, Page 356Get this manual
Predelivery checkGeneral Periodic Maintenance 2For the 2nd hour of operation b: Increase engine speed as much as necessary to put the boat on plane (but avoid full-throttle operation), then back off on the throttle while keeping the boat at planing speed3Remaining hours c: Run the engine at any speedHowever, avoid operating at full throttle for more than minutes at time4After the 1st 10 hours: Operate the engine normally1Check the anodes and trim tabSee "Checking the cylinder head anode" (742), "Checking the exhaust cover anode" (7-48), "Checking the exhaust guide anode" (9-31), "Checking the clamp bracket anode" (9-38), "Checking the hydro tilt anode" (9-41), and "Checking the lower unit anode" (8-3) 0 8
Replace the anodes or trim tab if excessively erodedIn addition, check the ground lead
Checking the battery
1Check the batterySee "Checking the battery" (10-3)
Checking the cooling water passage
1Remove the water inlet covers a10