91301-ZG3-000 Honda O-RING (42.2X2.4) (Honda Code 3621125).

When the engine is in the AUTOMATIC mode, the engine can start at any moment. To avoid personal injury, always remain clear of the the engine when the engine is in the AUTOMATIC mode.
For automatic starting, the engine control switch must be in the AUTO position or in the REMOTE position. The engine will automatically start when the remote start/stop initiate contact closes.Manual Starting
For initial start-up of a new or rebuilt engine, and for start-up of an engine that has been serviced, make provision to shut the engine off should an overspeed occur. This may be accomplished by shutting off the air and/or fuel supply to the engine.
Do not start the engine if a "DO NOT OPERATE" warning tag or a similar warning tag is attached to any of the controls.Ensure that no one will be endangered before the engine is started and when the engine is started.
Perform all the procedures that are described in this Operation and Maintenance Manual, "Before Starting Engine" topic (Operation Section).
Do not engage the starting motor when flywheel is turning. Do not start the engine under load.If the engine fails to start within 30 seconds, release the starter switch or button and wait two minutes to allow the starting motor to cool before attempting to start the engine again.
Ensure that the marine transmission is disengaged (if equipped).Note: If the optional prelube is used, the prelube pump will operate before cranking begins. The ECM will allow the engine to be operated at rated rpm when the oil pressure sensors indicate that the oil pressure is sufficient.Starting the Engine with the Cat Marine Engine Control Panel I (MECP I) (If Equipped)
Illustration 1 g03199056
(1) "OFF/MANUAL/REMOTE" switch
(2) "START" switchNote: The engine key switch and the start circuits are controlled by the "OFF/LOCAL/REMOTE" switch. The position of the "OFF/LOCAL/REMOTE" switch does not affect the operation of the "STOP" switch.
Position the "OFF/LOCAL/REMOTE" switch to the LOCAL position or to the REMOTE position.
Activate the "START" switch to start the engine.Starting the Engine with the Cat Marine Engine Control Panel III (MECP IIIB) (If Equipped)
Illustration 2 g06087623
(1) Digital control unit
(2) Engine control switch (ECS)
(3) Emergency stop button
(4) Home button
(5) Alarm list button
(6) Start button
(7) Stop button
(8) Throttle
Illustration 3 g06089081
View of Engine control switch selections.
(2) Engine control switch (ECS)
(9) Off
(10) Local
(11) Remote
Illustration 4 g03200996
(7) "CRANK OVERRIDE" switch
(8) "SHUTDOWN OVERRIDE" switch
(9) "TORQUE LIMIT" switchWhen the "OFF/LOCAL/REMOTE" switch is in LOCAL mode, the engine cannot be started from the remote control unit. The LOCAL position does not energize the key switch (J906 circuit) beyond the engine harness.
Position the "OFF/LOCAL/REMOTE" switch to the LOCAL position or to the REMOTE position.
Activate the "START" switch to start the engine.Note: If the "START" switch does not start the engine, start the engine with the "CRANK/OVERRIDE" switch inside the control box.Note: For further information regarding the MECP IIIB control panel refer to LEBM0070 , "Cat Marine Control Panel (MECP II)"Operation and Maintenance ManualFor further more information concerning the MECP IIIB use the following web address:https://engines.cat.com/en/marine/products/control-systems/a-p-panels.html
Select Cat Marine Panel MECP IIIB Operation and Maintenance Manual link found under Service Information.