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. Suzuki 115 Hp 4 Stroke Owners Manual download free. 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. 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. download Polaris 350 4x4 Manual. 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.