2000-2005 Yamaha F40B Outboard Service Manual, Page 90Get this manual
.1CONTROL SYSTEM EXHAUST GAS CONTROL PROCEDURES
1Installation: Exhaust probe set
Setting steps (1) Remove the mm bolts CD and their washers(2) Install the exhaust gas probe 0(3) Connect the hoses between the probes and the surge tank (4) Connect the gas analyzer hose to the surge tank,
2Preparations for measuring: Engine temperature
Warming up steps (1) Run the engine in neutral at the specified speed for 15 minutesEngine speed 2,OOO200 rmin