20 hp outboard motor electric start

20 hp outboard motor electric start

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Components of a 20 hp Outboard Motor Electric Start System

1. Battery: The electric start system relies on a 12 - volt battery to supply the necessary electrical power. Deep - cycle marine batteries are commonly used as they can withstand repeated discharges and charges without significant degradation. A fully charged battery is crucial for the proper operation of the entire system, as it provides the energy to engage the starter motor.


2. Starter Motor: The starter motor is the heart of the electric start system. It converts electrical energy from the battery into mechanical energy to crank the engine. In a 20 hp outboard motor, the starter motor is designed to provide enough torque to quickly spin the engine's crankshaft and initiate combustion. It is typically mounted near the engine block and connected to the flywheel via a gear mechanism. When the ignition switch is turned, an electrical current activates the starter motor, which then engages with the flywheel, starting the engine.


3. Ignition Switch: This is the user - interface component that controls the flow of electricity to the starter motor and other electrical systems in the outboard motor. When turned to the "start" position, it sends a signal to the starter solenoid, which in turn allows high - amperage current from the battery to flow to the starter motor.


4. Starter Solenoid: Acting as a relay, the starter solenoid receives a low - current signal from the ignition switch. Once activated, it closes a set of heavy - duty contacts, enabling the high - current flow from the battery to the starter motor. This high - current flow is necessary to power the starter motor's operation.


5. Wiring Harness: A series of electrical wires connect all the components of the electric start system. The wiring must be properly insulated and rated for marine use to withstand the harsh environment of saltwater, moisture, and vibration.

Advantages of Electric Start in a 20 hp Outboard Motor

1. Ease of Use: Electric start eliminates the physical exertion required for manual pull - starting. This makes it much more convenient, especially for boaters who may be fatigued or have physical limitations.


2. Reliability: Modern electric start systems are highly reliable, reducing the chances of engine starting failures. Unlike manual starting, which can sometimes be affected by factors such as improper priming or a worn - out recoil starter, electric start provides a consistent and quick starting process.


3. Quick Start - Ups: Electric start allows for rapid engine starting, which is essential in situations where a quick departure is needed, such as in emergency situations or when trying to catch up with a group.

Maintenance and Considerations

1. Battery Maintenance: Regularly check the battery's charge level and electrolyte levels (if it's a lead - acid battery). Keep the battery terminals clean and free of corrosion to ensure a good electrical connection. A weak or dead battery is one of the most common causes of electric start failures in outboard motors.


2. Starter Motor and Solenoid Checks: Periodically inspect the starter motor and solenoid for signs of wear, damage, or loose connections. Lubricate any moving parts as recommended by the manufacturer to ensure smooth operation.


3. Wiring Inspection: Check the wiring harness for any signs of fraying, cracking, or loose connections. Repair or replace any damaged wires promptly to prevent electrical issues.