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Predator Engines 173cc - User Manual

Predator Engines 173cc
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Visit our website at: http://www.harborfreight.com
Email our technical support at: tech@harborfreight.com
ITEM 68122 68123
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright
©
2010 by Harbor Freight Tools
®
. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
Tools required for assembly and service may not be included.
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-800-520-0882 as soon as possible.
Save This Manual Keep this manual for the safety warnings and precautions, assembly, operating,
inspection, maintenance and cleaning procedures. Write the product’s serial number in the back of the manual
near the assembly diagram (or month and year of purchase if product has no number). Keep this manual and
the receipt in a safe and dry place for future reference.
Owner’s Manual & Safety Instructions
173cc
Vertical Engine
Using an engine indoors
CAN KILL YOU IN MINUTES.
Engine exhaust contains carbon monoxide.
This is a poison you cannot see or smell.
NEVER use inside
a home or garage,
EVEN IF doors and
windows are open.
Only use OUTSIDE
and far away from
windows, doors,
and vents.
REV 11k

Table of Contents

Questions and Answers

  • C
    Cynthia OrtizAug 19, 2025
    What to do if Predator Engines 173cc Engine stops suddenly?
    • J
      Jenna JonesAug 19, 2025
      Your Predator Engines engine might stop suddenly due to: * Low oil shutdown. Ensure the engine oil is at the proper level, checking it before each use. * An empty fuel tank or impure/low-quality gasoline. Refill the tank with fresh 87+ octane unleaded gasoline. * A defective fuel tank cap creating a vacuum, which prevents proper fuel flow. Try testing or replacing the fuel tank cap. * A disconnected or improperly connected spark plug cap. Make sure the spark plug cap is securely connected.
  • H
    Hannah Blackwell MDAug 22, 2025
    What to do if Predator Engines engine misfires?
    • A
      Austin MccallAug 22, 2025
      If your Predator Engines engine is misfiring, consider these potential causes: * A loose spark plug cap. Check the wire connections. * An incorrect spark plug gap or a damaged spark plug. Re-gap or replace the spark plug. * A defective spark plug cap. Replace the spark plug cap. * Old or low-quality gasoline. Use only fresh 87+ octane unleaded gasoline. * Incorrect compression. Diagnose and repair the compression.
  • A
    Angela StantonAug 25, 2025
    Why Predator Engines engine knocks?
    • J
      Jessica EnglishAug 26, 2025
      A knocking Predator Engines engine can be attributed to several factors: * Old or low-quality gasoline. Refill the fuel tank with fresh 87+ octane unleaded gasoline. * The engine is overloaded. Avoid exceeding the equipment’s load rating.
  • M
    Mr. Hector Moore IIAug 28, 2025
    What to do if Predator Engines 173cc Engine stops when under heavy load?
    • S
      Stacey GarciaAug 28, 2025
      If your Predator Engines engine stops under a heavy load: * The air filter may be dirty. Clean or replace the filter element. * The engine may be running cold. Allow the engine to warm up before operating the equipment.
  • W
    William FergusonAug 31, 2025
    How to fix Predator Engines 173cc backfiring?
    • E
      Eric TurnerAug 31, 2025
      A Predator Engines engine might backfire because of: * Impure or low-quality gasoline. Fill the fuel tank with fresh 87+ octane unleaded gasoline. * The engine being too cold. Use cold weather fuel and oil additives to prevent backfiring. * Incorrect timing. Check the engine timing.
  • M
    Mr. Philip MurilloSep 3, 2025
    Why Predator Engines 173cc misfires?
    • R
      Richard AyalaSep 3, 2025
      If your Predator Engines engine misfires, it might be due to a loose spark plug cap, incorrect spark plug gap, a damaged or defective spark plug, old gasoline, or incorrect compression. Check the wire connections, re-gap or replace the spark plug, replace the spark plug cap, and use fresh 87+ octane unleaded gasoline. Diagnose and repair compression issues if needed.
  • W
    wandahaleSep 6, 2025
    What to do if Predator Engines engine knocks?
    • H
      huangkatherineSep 6, 2025
      If your Predator Engines engine knocks, it may be caused by old or low-quality gasoline, the engine being overloaded, or incorrect spark timing. Try filling the fuel tank with fresh 87+ octane unleaded gasoline and avoid exceeding the equipment's load rating. If the problem persists, have a qualified technician diagnose and service the engine.
  • P
    pattersonlisaSep 9, 2025
    Why Predator Engines engine stops when under heavy load?
    • E
      Elizabeth RamirezSep 9, 2025
      If your Predator Engines engine stops when under a heavy load, it could be due to a dirty air filter or the engine running cold. Try cleaning or replacing the air filter and allow the engine to warm up before operating the equipment.
  • W
    Walter NelsonSep 12, 2025
    How to prevent Predator Engines 173cc Engine from backfiring?
    • R
      Robert HenrySep 12, 2025
      To prevent your Predator Engines engine from backfiring, ensure you are using fresh 87+ octane unleaded gasoline. Backfiring could also be caused by the engine being too cold, a stuck intake valve, an overheated engine, or incorrect timing. Use cold weather fuel and oil additives. If the intake valve is stuck or the engine is overheated, or if the timing is incorrect, have a qualified technician diagnose and service the engine. Check engine timing.
  • Q
    qhintonNov 15, 2025
    Why Predator Engines 173cc Engine will not start?
    • K
      Katherine SmithNov 15, 2025
      There are several reasons why your Predator Engines engine might not start: * If it's a mower engine, ensure the brake handle is held down and the brake cable is properly adjusted. Also, make sure the mower is on a clear area, free of grass or loose objects. * Check the fuel level; the tank may be empty. If so, fill it. * The gasoline may be old or of low quality. Use fresh 87+ octane unleaded gasoline. * The carburetor may not be primed. Press the priming bulb before starting a cold engine. * The fuel passageways may be dirty. Clean them using a fuel additive. Heavy deposits might need more thorough cleaning. * The carburetor needle might be stuck. If you smell fuel in the air, gently tap the side of the carburetor float chamber with a screwdriver handle. * There might be t...

Summary

Safety Warnings

WARNING SYMBOLS AND DEFINITIONS

Defines safety alert symbols and warnings used in the manual.

Symbol Definitions

Explains various symbols used for warnings and their meanings.

Service Precautions

Refueling

Important safety guidelines and procedures for refueling the engine.

Operation

Pre-Start Checks

Essential inspections and checks to perform before starting the engine.

Checking and Filling Engine Oil

Procedures for checking and adding engine oil to ensure proper lubrication.

Checking and Filling Fuel

Steps for safely checking and filling the fuel tank with appropriate gasoline.

Maintenance

Cleaning, Maintenance, and Lubrication Schedule

A schedule outlining routine maintenance tasks and their frequencies.

Warranties

Limited 90 Day Warranty

Details the warranty coverage period and exclusions for product defects.

Emission Control System Warranty

Explains the warranty specific to the engine's emission control system.

Predator Engines 173cc Specifications

General IconGeneral
Engine Type4-stroke OHV
Displacement173cc
Fuel TypeUnleaded gasoline
Starting SystemRecoil
Governor TypeMechanical
Oil TypeSAE 10W-30
Max Torque8.1 ft-lb
Shaft Size3/4 inch diameter
Ignition SystemTransistorized magneto

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