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Yamaha SX150B - User Manual

Yamaha SX150B
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SX150B
SX200B
OWNER’S MANUAL
U.S.A.Edition
LIT-18626-04-99
67K-9-14 hyoshi 4/10/02 2:48 PM Page 1 (2,1)

Table of Contents

Questions and Answers

  • X
    Xavier RamirezAug 11, 2025
    What to do if my Yamaha Outboard Motor engine won't start but the starter operates?
    • K
      Kristen AlexanderAug 11, 2025
      If your Yamaha Outboard Motor engine won't start but the starter is operating, several factors could be at play. First, ensure the fuel tank isn't empty and is filled with clean, fresh fuel. Check for a clogged fuel filter, and clean or replace it if necessary. Also, make sure the spark plugs aren't fouled or of an incorrect type; inspect, clean, or replace them as needed. Confirm that the spark plug caps are correctly fitted and that there are no poor connections or damaged ignition wiring. Finally, verify the engine stop switch lanyard is attached. If problems persist, the fuel pump or ignition parts may be faulty, or engine inner parts damaged, requiring service by a Yamaha dealer.
  • F
    fhartAug 20, 2025
    What to do if the warning buzzer sounds on my Yamaha SX150B?
    • P
      Priscilla MillerAug 20, 2025
      If the warning buzzer sounds or the indicator lamp lights on your Yamaha Outboard Motor, it could be due to several reasons. Check the water intake for any restrictions that might be clogging the cooling system. Ensure the engine oil level is adequate and fill the oil tank with the specified engine oil if it's low. Verify that the spark plug has the correct heat range and replace it with the recommended type if needed. Also, check that you're using the specified engine oil and replace it if not. If the engine oil is contaminated or deteriorated, replace it with a fresh, specified type. Other potential issues could involve a clogged oil filter, a malfunctioning oil feed/injection pump, a faulty water pump/thermostat, or an improperly distributed load on the boat.
  • K
    Kimberly JenkinsAug 25, 2025
    How to fix a Yamaha SX150B Outboard Motor that idles irregularly?
    • M
      Mr. Scott Brown PhDAug 26, 2025
      If your Yamaha Outboard Motor engine idles irregularly or stalls, several factors could be responsible. Begin by inspecting the spark plugs; clean or replace them if they are fouled or of an incorrect type, and check that the spark plug gap is correct. Examine the fuel system for any obstructions, such as a pinched or kinked fuel line. Ensure the fuel tank is filled with clean, fresh fuel. Also, check the fuel filter and clean or replace it if it's clogged. Verify that the air vent screw on the fuel tank is open and that the choke knob is in the home position. Make sure the motor angle is at the normal operating position and the fuel joint connection is correct. Additionally, ensure the battery lead is securely connected.
  • L
    Lisa JohnstonAug 30, 2025
    Why won't the starter operate on my Yamaha SX150B?
    • V
      Victor HicksAug 30, 2025
      If your Yamaha Outboard Motor starter won't operate, it could be due to several reasons. The battery capacity might be weak or low, so check the battery condition and use one of the recommended capacity. The battery connections could be loose or corroded; in this case, tighten the battery cables and clean the battery terminals. Also, the fuse for the electric start circuit might be blown, so check for the cause of the electric overload and repair it, then replace the fuse with one of the correct amperage. Ensure the shift lever is in neutral. If these steps don't resolve the issue, the starter components may be faulty, and you should have them serviced by a Yamaha dealer.
  • K
    Kevin Ramos Jr.Sep 4, 2025
    Why is my Yamaha Outboard Motor vibrating excessively?
    • S
      Stephanie BaxterSep 4, 2025
      If your Yamaha Outboard Motor vibrates excessively, there are several potential causes. Check the propeller for any damage and have it repaired or replaced if necessary. Inspect the propeller for weeds or other foreign matter and remove and clean the propeller if needed. Ensure the motor mounting bolt is tight. If the steering pivot is loose or damaged, tighten it.
  • A
    Adam EscobarNov 14, 2025
    Why is my Yamaha SX150B losing power?
    • K
      Kevin WilliamsonNov 14, 2025
      If your Yamaha Outboard Motor engine is losing power, several factors could be contributing. Start by checking the propeller for damage and have it repaired or replaced if necessary. Ensure the propeller's pitch and diameter are correct for optimal outboard operation. Adjust the trim angle for efficient performance and verify the motor is mounted at the correct height on the transom. Also, consider whether the boat bottom is fouled with marine growth and clean it if needed. Inspect the spark plugs; clean or replace them if fouled or of an incorrect type, and ensure the spark plug gap is correct. Check for obstructions in the fuel system and a clogged fuel filter. Finally, make sure you're using the specified engine oil. Other potential causes include a damaged fuel pump, incorrect fuel joi...

Yamaha SX150B Specifications

General IconGeneral
Engine Type2-Stroke
Horsepower15 hp
Cylinders2
Gear Ratio2.08:1
Starting SystemManual
Oil Mix Ratio50:1
Displacement246 cc
Bore x Stroke56 mm x 50 mm
Fuel TypeGasoline
Cooling SystemWater Cooled
Shaft Length15 in

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