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Mercury 80hp 2 Stroke Service Manual

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Clymer Mercury Marine service and repair manuals are written with model. Mercury/Mariner 75 HP, 90 HP. Mercury/Mariner 2.5-60 hp 2-stroke outboard motors manual. Mercury 2-Stroke Outboard Boat Motor service manuals are available for immediate download! This service is available for only $4.95 per download! If you have a dirty old paper copy of this manual or a PDF copy of this manual on your computer and it crashed we can help! Mercury 40 / 50 / 60 Hp EFI 4 Stroke Outboard Repair Manual. Mercury Mariner Outboard 70 75 80 90. 2008 Mercury 60 Hp 4 Stroke Service Manual Mercury 40.

1965-1989 Service Manual Application: 2 hp To 40hp 2 Stroke 1 & 2 cylinder engines. A Typical Mercury-Mariner Service Manual Contains The Following Chapters: Subjects may differ depending on year/model. RELATED MERCURY - MARINER OUTBOARD SEARCHES: Carburetor Models: CARBURETOR Theory of Operations Prime Start System This carburetor assembly uses the PrimeStart system for precise fuel delivery during start-up, at all temperatures. Two electrothermal valves are installed on the carburetor assembly. The upper electrothermal valve controls fuel flow for carburetors #1 and #2, and the lower valve controls fuel flow for carburetors #3 and #4.

Mercury Outboard 80 HP Forum Topics. Mercury Outboard Parts Powerheads. Service manual needed for 1982 Mercury 80 Hp manual # 90-86134--4 / 1291: 2. I need to know the mix ratio for 1971 Mercury 800 80 hp: 12: mercury 115 hp stroke 80's model parts: 3: 1974 Mercury 65 hp - runs fine 80% of time then bogs down.

Before start-up, the electrothermal ram (needle) is retracted (the fuel enrichment valve is opened) according to the temperature, allowing a high percentage of fuel to flow form the flat chamber into the venturi during start-up. During start-up, the electrothermal ram (needle) is still retracted (the fuel enrichment valve is opened) according to the temperature, allowing a rich air/fuel mixture to be fed to the cylinders. After start-up, the current supplied form the electric power source and then flows to the electrothermal valves causing the wax in the valves to heat up. As the wax heats up the electrothermal ram (needle) begins to extend, partially closing the fuel enrichment valve, and reducing the flow of fuel from the float chamber into the venturi. After a few minutes, the electrothermal ram (needle) is fully extended, the fuel enrichment valve is fully closed, and enrichment ceases. A - Electrothermal Valve b - Fuel Enrichment Valve c - Electrothermal Ram (needle) d - Carburetor #1 and #3 e - Carburetor #2 and #4 Acceleration This carburetor assembly uses an accelerator pump to ensure that the proper amount of fuel reaches all of the carburetors during rapid throttle openings (preventing temporary lean conditions). As the throttle is opened, the throttle lever rotates and pushes the throttle lever link rod.

The throttle lever link rod then pushes the diaphragm in the dashpot, forcing out the air. Massey Ferguson 283 Operators Manual. The air flows through the in-line, one-way valve, and then to all of the carburetors. This additional air flows into the carburetors and mixes with the fuel from the main jets. This air/fuel mixture is then injected into the venturi, ensuring that enough fuel reaches the engine. As the throttle is closed, the throttle lever rotates back and the throttle lever link rod returns, causing the diaphragm in the dashpot to move back, As the diaphragm moves back, suction causes the air from the venturi of carburetor #4 to flow through a one-way valve in the carburetors and back to the dashpot. The in-line, one-way valve prevents the air in the hoses from flowing back to the dashpot.

Also, the diaphragm functions as a coasting enrichener during quick deceleration, preventing the engine form stalling. A - Throttle Lever b - Throttle Lever Link Rod c - Diaphragm d - Dashpot e - In-Line, One-Way Valve f - To Carburetor #1 g - To Carburetor #2 h - To Carburetor #3 i - Main Jet j - One-Way Valve Carburetor Adjustments Float Level 1. With carburetor turned upside down, and carb scale seated on inner edge, check float level from top of float to float bowl flange as shown. Adjust tab if out of specification.

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NOTE: Measure float level without gasket. NOTE: Bend tab to adjust float height. Idle Speed NOTE: Outboard should be completely warmed up for the idle speed adjustment. With the outboard in forward gear, adjust idle speed screw to obtain the specified idle speed. NOTE: Turning idle speed adjustment screw; -clockwise will increase engine idling speed. -counterclockwise will decrease engine idling speed.

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CYLINDER HEAD Adjustments Valve Clearance NOTE: Valve clearance adjustment should be made on a cold engine at room temperature. Remove flywheel cover and spark plug cover. Disconnect spark plug leads and fuel hoses. A - Screw (2) M6 x 20 b - Flywheel Cover c - Screw (5) M6 x 16 d - Spark Plug Cover e - Fuel Hoses 3. Align timing marks on driven cams. NOTE: Use flywheel holder (91-83163M) to rotate flywheel and align timing marks. Loosen timing belt tensioner bolt and remove tensioner spring.

A - Timing Marks b - Timing Belt Tensioner Screw M10 x 45 c - Tensioner Spring 5. Remove timing belt and driven sprockets. Remove cylinder head cover and spark plugs. A - Driven Sprocket Screw (2) M10 x 35 b - Washer (2) c - Driven Sprocket (2) d - Pin (2) e - Breather Hose f - Screw (14) M6 x 30 g - Cylinder Head Cover h - Rubber Gasket 7. Re-install driven sprockets and timing belt. NOTE: Make sure timing marks are still aligned. A - Pin (2) b - Washer (2) c - Driven Sprocket (2) d - Driven Sprocket Screw (2) M10 x 35 e - Timing Marks Aligned Driven Sprocket Screw Torque - 44 lb-ft (60 Nm) 8.

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