I use 80 weight gear oil.
Most outboard manufacturers recommend a good quality 10W-30 motor oil for use in colder climates.
any good quality two stoke oil including outboard motor oil
Premium gasoline
5w-30
The recommended spark plug for a 1992 model, 200hp Mercury 2 stroke carbureted outboard, is an NGK BU8H. This is a perma-gap type plug, so no gap setting is required.
2 stroke-NOT outboard, but the same type such as used in chainsaws
For a 90hp Mercury two-stroke outboard, you should use a high-quality lower unit gear lube specifically designed for outboard motors. Mercury recommends using their own brand of gear lube, such as Mercury High-Performance Gear Lube or Quicksilver Gear Lube, which offer excellent protection against wear and corrosion. Always check the owner's manual for specific recommendations regarding viscosity and any additional requirements.
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
Impellep Pump
The fuel mixture for a Yamaha 40 hp 2 stroke outboard engine is 50:1, gas, oil mixture. You should use new gas when you get the engine ready for the season.
The Force 40ELP engine is a 2-stroke outboard motor. For this type of engine, the recommended gas-to-oil mixture is typically 50:1, which means 2.6 ounces of 2-stroke oil per gallon of gasoline. Always consult the owner's manual for the most accurate information specific to your engine model.
you need a minimum of 87 octane gas