Parsun F20A BM - User Manual

Questions and Answers

M
marcramirezAug 9, 2025
What to do if my Parsun Outboard Motor engine will not start?
- A
  amysmithAug 9, 2025
  If your Parsun Outboard Motor engine won't start (but the starter operates), consider these potential causes and solutions: * The fuel tank may be empty: Fill the tank with clean, fresh fuel. * The fuel may be contaminated or stale: Fill the tank with clean, fresh fuel. * The fuel filter may be clogged: Clean or replace it with the recommended type. * The spark plug(s) may be fouled or of the incorrect type: Inspect, clean, or replace with the recommended type. * The spark plug cap(s) may be fitted incorrectly: Check and refit the cap(s). * The ignition wiring may be damaged or poorly connected: Check wires for wear or breaks, tighten all loose connections, and replace worn or broken wires. * The engine stop switch lanyard may not be attached: Attach the lanyard.
J
John BarronAug 15, 2025
How to fix a Parsun F20A BM when the starter will not operate?
- B
  Blake BurnsAug 15, 2025
  If the starter on your Parsun Outboard Motor will not operate, verify that the shift lever is in neutral. If it is not, shift to neutral.
J
Jennifer WallaceSep 2, 2025
Why does my Parsun Outboard Motor vibrate excessively?
- D
  Diane WilliamsSep 2, 2025
  Excessive vibration in your Parsun Outboard Motor could be due to: * A damaged propeller: Repair or replace the propeller. * Weeds or foreign matter tangled on the propeller: Remove and clean the propeller. * A loose motor mounting bolt: Tighten the bolt. * Loose steering pivot: Tighten it.
R
Ryan MelendezNov 20, 2025
Why is my Parsun Outboard Motor engine losing power?
- P
  peterjohnsonNov 20, 2025
  A loss of power in your Parsun Outboard Motor can stem from several issues: * A damaged propeller: Repair or replace the propeller. * Incorrect trim angle: Adjust the trim angle for optimal operation. * Incorrect motor mounting height: Adjust the motor to the proper transom height. * A boat bottom fouled with marine growth: Clean the boat bottom. * Weeds or foreign matter tangled on the gear housing: Remove the foreign matter and clean the lower unit. * Fouled or incorrect spark plug(s): Inspect, clean, or replace with the recommended type. * An obstructed fuel system: Check for pinched or kinked fuel lines or other obstructions. * A clogged fuel filter: Clean or replace the fuel filter. * Contaminated or stale fuel: Fill the tank with clean, fresh fuel. * Incorrect sp...
C
Cynthia MurrayNov 26, 2025
What to do if my Parsun Outboard Motor engine idles irregularly or stalls?
- A
  Angela MorganNov 26, 2025
  An irregular idle or stalling in your Parsun Outboard Motor can arise from various causes. Here's what to check: * Fouled or incorrect spark plug(s): Inspect, clean, or replace with the recommended type. * Obstructed fuel system: Check for pinched or kinked fuel lines. * Contaminated or stale fuel: Replace with clean, fresh fuel. * Clogged fuel filter: Clean or replace the fuel filter. * Incorrect spark plug gap: Inspect and adjust as specified. * Damaged or poorly connected ignition wiring: Check for wear or breaks, tighten loose connections, and replace worn or broken wires. * Incorrect engine oil: Check and replace the oil as specified. * Closed air vent screw on the fuel tank: Open the air vent screw. * Incorrect fuel joint connection: Connect correctly. * Choke kn...

Summary

General Information and Components

Main components

Fueling instruction

Operation

Installation

Procedures for properly mounting the outboard motor onto a boat.

Mounting height

Guidance on setting the optimal mounting height for the outboard motor.

Clamping the outboard motor

Instructions for securely attaching the outboard motor to the transom.

Breaking in engine

Pre-operation checks

Checks to perform before starting the outboard motor.

Filling fuel

Steps for safely filling the fuel tank.

Starting engine

Detailed steps for starting the outboard motor.

Warm up engine

Shifting

How to change gears for forward and reverse operation.

Tiller

How to use the tiller for steering and speed control.

Stopping engine

Procedures for properly stopping the outboard motor.

Trimming outboard motor

Tilting up

Tilting down

Cruising in shallow water

Warning indicators and solutions

Explains warning lights and indicators and their solutions.

Maintenance

Cleaning and adjusting spark plug

Checking the fuel system

Changing engine oil

Checking propeller

Changing gear oil

Maintenance Table

Transporting and Storing

Transporting

Storing

Actions in Emergency

Impact damage

Starter will not operate

Treatment of submerged motor

Steps for dealing with a submerged outboard motor.

Troubleshooting

Starter will not operate

Solutions for when the starter mechanism does not function.

Engine will not start (starter operates)

Reasons and fixes for the engine failing to start.

Engine idles irregularly or stalls

Diagnosing and resolving issues with irregular idling or stalling.

Engine power loss

Troubleshooting causes and solutions for reduced engine power.

Engine vibrates excessively

Parsun F20A BM Specifications

General

Engine Type	4-Stroke
Power Output	20 HP
Displacement	362 cc
Fuel Type	Gasoline
Starting System	Manual
Gear Ratio	2.08:1
Shaft Length	20 inches
Max. Output	20 HP
Cylinder	2
Steering System	Tiller
Full Throttle RPM Range	5000-6000 RPM
Weight	54 kg