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Greyhound 66015 - User Manual

Greyhound 66015
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HORIZONTAL
- OHV
SET UP, OPERATING, AND SERVICING
INSTRUCTIONS
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.
Diagrams within this manual may not be drawn proportionally.
Due to continuing improvements, actual product may differ slightly from the product described herein.
Distributed exclusively by Harbor Freight Tools
®
.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright
©
2008 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.
For technical questions or replacement parts, please call 1-800-444-3353.
Model
66015
6.5 HP GAS ENGINE

Table of Contents

Questions and Answers

  • C
    Clifford MitchellAug 12, 2025
    How to start Greyhound Engine?
    • S
      Shawn BarberAug 12, 2025
      If your Greyhound Engine won't start, there are several things to check: Ensure the On/Off switch is in the On position. Make sure the gas valve is pushed to the open position. Verify the choke is set to the closed position. Check if the gas tank is empty and fill it if needed. Also, the spark plug may be dirty and require cleaning. If none of these steps work, there may be a technical problem requiring service by a qualified mechanic.
  • D
    Denise DavisAug 16, 2025
    Why Greyhound 66015 Engine runs rough?
    • M
      Michelle WatkinsAug 16, 2025
      If your Greyhound Engine runs roughly and makes pinging noises, it could be due to using the wrong type of gasoline. Replace the existing gasoline with 89 octane gas. Another possibility is that the gasoline contains water, in which case you should empty the tank and replace the gas.
  • K
    Kathleen SmithAug 19, 2025
    What to do if Greyhound Engine does not reach full speed?
    • A
      Andrew HarrisAug 20, 2025
      If your Greyhound Engine does not reach full speed, check if the choke is closed and open it. Clogged air filters can also cause this issue, so clean the air filter elements. If neither of these solutions works, a qualified mechanic should service the engine, as there may be a technical problem.
  • F
    Frances ArnoldAug 23, 2025
    What to do if Greyhound Engine stops by itself?
    • T
      timothypooleAug 23, 2025
      If your Greyhound Engine stops by itself even when it has gas, the low oil level auto shut off may be the cause. Check the oil level and add oil if needed. If the oil level is sufficient, the issue may be a technical problem that requires service by a qualified mechanic.
  • G
    Gregory HarrisAug 27, 2025
    Why is Greyhound 66015 difficult to start even with good compression, gas supply and spark?
    • S
      Seth SimsAug 27, 2025
      If your Greyhound Engine is difficult to start despite having good cylinder compression, gas supply, and ignition coil spark, the spark plug may have carbon buildup or dirt on and around the electrodes, so remove and clean the spark plug. The electrodes could also be burned, in which case you should replace the spark plug. Finally, the spark gap may be improper, so adjust the spark plug electrodes.
  • K
    Karen JonesAug 31, 2025
    How to fix Greyhound 66015 Engine that is hard to start with good compression and spark?
    • R
      Robin StephensAug 31, 2025
      If your Greyhound Engine is difficult to start, but the cylinder compression and spark are okay, it's possible that the fuel supply is blocked due to a clogged air vent in the gas cap. Clean the gas cap air vent. A plugged gas valve can also cause this, so unclog the gas valve. Additionally, the main jet might be clogged or misadjusted, requiring cleaning and/or readjustment. The needle valve may be improperly closed, or the start hole is clogged, so take apart the needle valve and repair, clean, and blow it out. Lastly, the floater in the fuel tank could be damaged or sticking, necessitating repair of the floater.
  • E
    estradachristopherSep 3, 2025
    What to do if Greyhound 66015 Engine is hard to start with compression, spark and gas?
    • D
      David RiveraSep 3, 2025
      If your Greyhound Engine is difficult to start despite having good cylinder compression, spark, and gas supply, the gas may be dirty, have water, or be old, so drain and replace the gas. Another possibility is that the engine cylinder is flooded, in which case you should drain the extra gas and dry the spark plug electrodes. Also, the gas might be the wrong type, so drain and replace it.
  • K
    kpittsSep 7, 2025
    Why Greyhound 66015 Engine is hard to start with good gas supply and ignition?
    • A
      Audrey VaughnSep 7, 2025
      If your Greyhound Engine is difficult to start even with a good gas supply and ignition system, it could be due to a worn, sticking, or broken piston ring, so replace the piston rings or clean out carbon fouling. A loose spark plug or one without a gasket can also cause this, so tighten the spark plug with a gasket. Air leakage between the cylinder block and cylinder or in the valve can also be responsible, so check the cylinder gasket and bolts, and check the valve clearance and thickness, repairing if required.

Summary

SPECIFICATIONS

SAFETY WARNINGS AND PRECAUTIONS

UNPACKING

MOUNTING

OPERATION

Controls and Indicators

Identifies and illustrates key engine controls and indicators for operation.

Pre-Operation Checks

Starting the Engine

Stopping the Engine

TROUBLESHOOTING

General;Basic Troubleshooting

Common causes and remedies for general engine issues like not starting or running rough.

Engine Difficult to Start

Detailed causes and solutions when the engine fails to start.

Low Engine Power

Identifies causes and solutions for reduced engine power or slow response.

Engine not Running Smoothly

Addresses issues causing the engine to run unevenly, ping, or stall.

Engine Excessively Hot

Lists potential causes and remedies for the engine overheating during operation.

Abnormal Engine Noise

Explains causes of unusual noises like banging or metal-on-metal sounds.

MAINTENANCE

Scheduled Maintenance

Outlines maintenance tasks and their recommended frequency based on usage.

Cleaning Air Filter

Instructions for cleaning the engine's air filter assembly.

Cleaning and Replacing Spark Plug

Steps for cleaning and replacing the spark plug for optimal performance.

Changing Oil

Step-by-step guide for draining and refilling engine oil.

Cleaning the Deposit Cup

Instructions for cleaning the fuel system's deposit cup.

Torque Value for Major Engine Bolts

Transporting the Engine

Storing the Engine

ORDERING PARTS

PARTS LISTS AND ASSEMBLY DIAGRAMS

Crankcase Assembly Diagram

Visual diagram showing the assembly of the engine's crankcase components.

Crankcase Parts List

Lists the individual parts for the crankcase assembly with descriptions and quantities.

Crankcase Cover Assembly Diagram

Visual diagram illustrating the assembly of the crankcase cover.

Crank Case Cover Parts List

Lists parts for the crankcase cover assembly with descriptions and quantities.

Cylinder Head and Cover Assembly Diagram

Diagram detailing the cylinder head and its cover components.

Cylinder Head and Cover Parts List

Lists parts for the cylinder head and cover assembly, including descriptions and quantities.

Crankshaft, Piston, and Connecting Rod Assembly Diagram

Visual breakdown of the crankshaft, piston, and connecting rod assembly.

Crankshaft, Piston, and Connecting Rod Parts List

Lists parts for the crankshaft, piston, and connecting rod assembly.

Camshaft and Rocker Valve Assembly Diagram

Diagram showing the camshaft and rocker valve assembly.

Camshaft and Rocker Valve Parts List

Lists parts for the camshaft and rocker valve assembly.

Carburetor Assembly Diagram

Illustrates the assembly of the carburetor system.

Carburetor Parts List

Lists individual parts of the carburetor assembly with descriptions and quantities.

Fuel Tank Assembly Diagram

Diagram showing the components of the fuel tank assembly.

Fuel Tank Parts List

Lists parts for the fuel tank assembly with descriptions and quantities.

Air Cleaner Assembly Diagram

Diagram illustrating the air cleaner assembly.

Air Cleaner Parts List

Lists parts for the air cleaner assembly with descriptions and quantities.

Muffler Assembly Diagram

Diagram showing the muffler assembly.

Muffler Parts List

Lists parts for the muffler assembly with descriptions and quantities.

Recoil Starter Assembly Diagram

Diagram illustrating the recoil starter assembly.

Recoil Starter Parts List

Lists parts for the recoil starter assembly with descriptions and quantities.

Regulator Control Assembly Diagram

Diagram showing the regulator control assembly.

Regulator Control Parts List

Lists parts for the regulator control assembly with descriptions and quantities.

Flywheel Assembly Diagram

Diagram illustrating the flywheel assembly.

Flywheel Parts List

Lists parts for the flywheel assembly with descriptions and quantities.

Ignition Coil Assembly Diagram

Diagram showing the ignition coil assembly.

Ignition Coil Parts List

Lists parts for the ignition coil assembly with descriptions and quantities.

Wiring Diagram

LIMITED 90 DAY WARRANTY

EMISSION CONTROL SYSTEM WARRANTY

Manufacturers Warranty Coverage

Specifies the warranty period for manufacturer defects.

Harbor Freight Tools Emission Control Defects Warranty Coverage

Details HFT's warranty for emission control parts defects.

Owners Warranty Responsibilities

Outlines the owner's duties for maintaining warranty coverage.

Harbor Freight Tools Emission Control Defects Warranty Provisions

Lists the terms and conditions for warranty claims and exclusions.

Warranted Parts

Lists the specific engine components covered under the emission control warranty.

Greyhound 66015 Specifications

General IconGeneral
BrandGreyhound
Model66015
CategoryEngine
LanguageEnglish

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