Follow the link for the steps.
Very good-with the exception of the oil sensor mounted on the engines-I have twins and they have failed to often.
The Mercury EFI outboards require a minimum octane rating of 87. Since the engine will operate on the lower octane fuel, it is a matter of personal preference.
weight of 1999 mercury 200 efi
The alarm on your Mercury 150 EFI two-stroke engine typically indicates a battery issue, such as low voltage or a failing battery. It may also signal problems with the charging system, like a malfunctioning alternator or rectifier. Additionally, ensure that all connections are clean and secure, as corroded or loose connections can lead to alarm triggers. Regularly checking the battery's health and the charging system can help prevent these alarms.
Electronic Fuel Injection (EFI)
EFI stands for electronic fuel injection.
10 degrees BTDC ( with EFI / electronic fuel injection ) unless engine compartment decal shows different
475lbs
Yes, possibly one of your temperature sensors located in the head. More likely it is one of your thermostats not opening or plugged with debris. This is especially so if engine is operated in salt water. The temp sensor does not malfunction very often.
The 1997 model Mercury, 225 hp EFI uses a NGK BR8HS plug, gapped to .035 in.
Electronic fuel injection