MERCURY 90-74059 Outboard Manual Catalog Merc

( Part Type: Hp Manual ), ( Manufacturer Part Number: 90-74059 ), ( Media Type: Parts Manual ), ( Publisher: Mercury Marine )

Review MERCURY 40 Hp Model Outboard Parts Manual Catalog fits MERC 1974–1977

The Mercury 90-74059 outboard motor is a powerful and efficient addition to any 1977 Merc 40 HP boat. This outboard motor is a part of Mercury Marine's legacy of high-performance and reliable engines.

The engine boasts a displacement of 89.5 cubic inches and a bore x stroke measurement of 3.25 inches x 3.43 inches. It has a compression ratio of 7.5:1, which ensures optimal combustion and power output. The engine is equipped with a single-carburetor system, specifically a 2-barrel Strato-Flo carburetor, that delivers an efficient fuel mixture for optimal performance.

The Mercury 90-74059 outboard motor features a mechanical fuel system and a manual shift/reverse system. The engine has a gear ratio of 2.25:1 and a gear case capacity of 3.4 gallons. It comes with a standard propeller, which has a three-blade design and a diameter of 15 inches.

The engine block is made of aluminum alloy, which provides strength and durability while keeping the weight to a minimum. The engine is also equipped with a water-cooled system, which ensures efficient heat dissipation and prolongs the engine's lifespan.

The Mercury 90-74059 outboard motor has a 12-volt electrical system and comes with a battery kit, which includes a 12-volt battery and necessary wiring. The engine also features an electric start system and a recoil starter as backup.

The engine's control system includes a manual choke and a tachometer. The tachometer measures engine RPM and provides valuable information to the operator for optimal performance. The engine also comes with a factory-installed ignition system and a spark plug system.

The Mercury 90-74059 outboard motor is designed for easy maintenance. It has a conveniently located oil filter, a spin-on oil filter element, and a sight gauge for easy oil level checking. The engine also has a conveniently located fuel filter and a water pump with a removable impeller.

The Mercury 90-74059 outboard motor is a powerful and efficient choice for any 1977 Merc 40 HP boat. Its high-performance features, durability, and ease of maintenance make it a popular choice among boaters. With its reliable engine design and Mercury Marine's commitment to quality, you can trust that this outboard motor will provide you with years of enjoyable boating experiences.

Mercury 90-74059 Outboard Motor: A Comprehensive Analysis

The Mercury 90-74059 outboard motor is a 40 horsepower, two-stroke engine, commonly used for small to medium-sized boats. In this analysis, we will discuss the key features, advantages, disadvantages, and a concluding recommendation.

1. Engine type: Two-stroke, 40 horsepower outboard motor.

2. Weight: Approximately 185 lbs (83.9 kg).

3. Shaft length: 20 inches (50.8 cm).

4. Fuel system: Carbureted.

5. Ignition system: Contact breaker.

1. Lightweight and compact design, allowing for easier maneuverability and storage.

2. Relatively simple design, which can lead to lower maintenance costs.

3. Suitable for a wide range of small to medium-sized boats.

4. Affordable price point compared to four-stroke engines.

1. Higher emissions due to the two-stroke design, which can contribute to air pollution.

2. Requires more frequent oil changes (every 50 hours) compared to four-stroke engines.

3. Fuel efficiency is lower compared to four-stroke engines.

4. Noise and vibration levels are generally higher than four-stroke engines.

The Mercury 90-74059 outboard motor offers a lightweight, compact, and affordable solution for smaller to medium-sized boats. Its simplicity can lead to lower maintenance costs compared to four-stroke engines. However, it comes with some drawbacks, such as higher emissions, lower fuel efficiency, and higher noise and vibration levels.

If you're looking for an outboard motor for a smaller to medium-sized boat, and prioritize affordability and ease of maintenance, the Mercury 90-74059 outboard motor could be a suitable option. However, if you're concerned about environmental impact, fuel efficiency, or noise levels, a four-stroke engine may be a better choice despite the higher upfront cost. Ultimately, the decision depends on your personal preferences, budget, and the specific requirements of your boat.

part # 9074059 prices

• $15.50-$24.99

specifications crafttract:

• for models: Merc
• for makes: Mercury
• for years: 1974-1977
• part type: Hp Manual
• manufacturer part number: 90-74059
• media type: Parts Manual
• publisher: Mercury Marine

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• policy: No Returns

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