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Email our technical support at: [email protected]

Email our engine support at: [email protected]

57531

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.

Owner’s Manual & Safety Instructions

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. 

21j

When unpacking, make sure that the product is intact 

and undamaged.  If any parts are missing or broken, 

please call 1-888-866-5797 as soon as possible.

Copyright

©

 2021 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.

Read this material before using this product. 

Failure to do so can result in serious injury. 

SAVE THIS MANUAL.

Summary of Contents for 57531

Page 1: ...l 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 21j When unpacking make sure that the p...

Page 2: ...0 63 Quart Bore x Stroke 70mm x 55mm Compression Ratio 8 5 1 Torque Specification for Cylinder Head Bolts 26 30 Nm 19 22 ft lb Rotation viewed from PTO power takeoff the output shaft Counterclockwise...

Page 3: ...rning Risk of Respiratory Injury Operate engine OUTSIDE and far away from windows doors and vents WARNING marking concerning Risk of Fire while handling fuel Do not smoke while handling fuel WARNING m...

Page 4: ...ece of equipment may become hazardous when used on another piece of equipment 14 Do not operate in explosive atmospheres such as in the presence of flammable liquids gases or dust Gasoline powered eng...

Page 5: ...by a qualified repair person using only identical replacement parts This will ensure that the safety of the equipment is maintained Do not attempt any service or maintenance procedures not explained i...

Page 6: ...r the Engine to cool and unplug the spark plug wire s before assembling or making any adjustments to the equipment The preparation of this Engine for competitive events and sanctioned racing requires...

Page 7: ...TENANCE Components and Controls Engine Switch Output Shaft Exhaust port LSVWLFN 2LO Fill plug Choke Lever Fuel Line Connector Spark plug Cap Starter Handle Oil Drain plug Carburetor Inlet Fuel pump In...

Page 8: ...ng pages refer to Parts List and Diagrams on page 16 Install Engine 1 Using a motor mount plate specifically designed for the go kart frame to be used both not included install the motor mount onto th...

Page 9: ...fuel pump a Inlet fuel line from fuel tank tank not included b Outlet fuel line to Carburetor c Low pressure pulse tube that is attached to the Pulse Connector not included When installing ensure that...

Page 10: ...th not included to the Carburetor inlet 2 Connect one end of a throttle cable not included to the Carburetor slide Connect the other end to the throttle on the go kart frame Note This engine is not eq...

Page 11: ...s of each piece of equipment will differ depending on factors such as duty cycle temperature air quality fuel quality and other factors Note The following procedures are in addition to the regular che...

Page 12: ...an as described below 2 Cleaning For paper filters To prevent injury from dust and debris wear ANSI approved safety goggles NIOSH approved dust mask respirator and heavy duty work gloves In a well ven...

Page 13: ...ine with dry cloth NOTICE Do not clean using water The water will gradually enter the Engine and cause rust damage Apply a thin coat of rust preventive oil to all metal parts 2 FUEL To protect the fue...

Page 14: ...its may require further cleaning 7 Gently tap side of carburetor float chamber with screwdriver handle 8 Turn Choke to RUN position Remove spark plug and pull the start handle several times to air out...

Page 15: ...park plug cap Engine stops when under heavy load 1 Dirty air filter 2 Engine running cold 1 Clean element 2 Allow engine to warm up prior to operating equipment Engine knocks 1 Old or low quality gaso...

Page 16: ...n Pin 1 15 Piston Clip 2 16 Crankcase Cover Assembly 1 17 Oil Plug 1 18 Dipstick 1 19 Cylinder Head 1 20 Intake Valve 1 21 Exhaust Valve 1 22 Valve Seal 1 23 Valve Spring 2 24 Air Deflector 1 25 Valve...

Page 17: ...Page 17 For technical questions please call 1 888 866 5797 ITEM 57531 SAFETY SETUp INSTALLATION MAINTENANCE Assembly Diagram...

Page 18: ...Page 18 For technical questions please call 1 888 866 5797 ITEM 57531 SAFETY SETUp INSTALLATION MAINTENANCE Mounting Hole Diagram Note Not to scale LQ PP LQ PP LQ P P LQ P P...

Page 19: ...chnical questions please call 1 888 866 5797 ITEM 57531 SAFETY SETUp INSTALLATION MAINTENANCE power Take Off Diagram Note Not to scale 81 5 16 24 UNF LQ PP LQ PP LQ PP LQ PP LQ PP LQ PP 1 79 LQ PP LQ...

Page 20: ...usion or limitation of incidental or consequential damages so the above limitation of exclusion may not apply to you THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLU...

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