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173cc Vertical Engine

68122 / 68123 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.

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.

Record Product’s Serial Number Here: 

 

(See Serial Number Location on page 7.) 

Note: 

If product has no serial number, record month and year of purchase instead.

Note:

  Some parts are listed and shown for illustration purposes only, and are not available individually 

as replacement parts.

Visit our website at: http://www.harborfreight.com

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.

Summary of Contents for 68122

Page 1: ...mber Location on page 7 Note If product has no serial number record month and year of purchase instead Note Some parts are listed and shown for illustration purposes only and are not available individ...

Page 2: ...Capacity 0 6 Quart Run Time 50 Load with full tank 40 minutes Sound Level 104 dB Bore x Stroke 70 mm x 45 mm Displacement 173cc Compression Ratio 8 5 1 Rotation viewed from PTO power takeoff the outpu...

Page 3: ...oderate injury NOTICE is used to address practices not related to personal injury CAUTION without the safety alert symbol is used to address practices not related to personal injury Symbol Definitions...

Page 4: ...ors and vents 2 Keep children away from the equipment especially while it is operating 3 Keep all spectators at least six feet from the Engine during operation 4 Fire Hazard Do not fill gas tank while...

Page 5: ...nts get very hot during use Stay clear of hot parts 21 Do not cover the engine or equipment during operation 22 Keep the equipment engine and surrounding area clean at all times 23 Use the equipment a...

Page 6: ...rbor Freight Tools for a replacement 6 Have the equipment serviced by a qualified repair person using only identical replacement parts This will ensure that the safety of the equipment is maintained D...

Page 7: ...l questions please call 1 800 520 0882 Vertical Engine Engine Components Starter Handle Priming Bulb Brake Arm Choke Air Filter Muffler Fuel Cap Dipstick XXXXXXXXXX Serial Number Location Write on fro...

Page 8: ...on 2 Install this engine on a lawn mower only 3 Set the Engine upright on the mower and align at least three 3 8 diameter coarse threaded engine mounting holes with mower mounting holes NOTE Depending...

Page 9: ...The SAE Viscosity Grade chart on page 13 in the Service section shows other viscosities to use in different average temperatures 5 Thread the Dipstick back in clockwise CAUTION Do not run the engine w...

Page 10: ...may be difficult to start on grass 1 Press the Priming Bulb 2 3 times to prime the engine 2 If the engine is cold adjust the Mower s choke control to the CHOKE START CLOSED position Note Location ope...

Page 11: ...EN position NOTE Moving the Choke Lever too fast could stall the engine IMPORTANT Allow the engine to run at no load for a minute or two with no load after each start up so that the engine can stabili...

Page 12: ...nce and Lubrication Schedule Note This maintenance schedule is intended solely as a general guide If performance decreases or if equipment operates unusually check systems immediately The maintenance...

Page 13: ...to allow all the oil to drain out Recycle used oil 4 Wipe off the dipstick with a clean lint free rag 5 Add the appropriate type of oil until the oil level is at the full level SAE 10W 30 oil is reco...

Page 14: ...torage as follows 1 CLEANING Wait for engine to cool then clean engine with dry cloth NOTICE Do not clean using water The water will gradually enter the engine and cause rust damage Apply a thin coat...

Page 15: ...dle several times to air out the chamber Reinstall spark plug and set Choke to CHOKE START CLOSED position IGNITION SPARK RELATED 1 Spark plug cap not connected securely 2 Spark plug electrode wet or...

Page 16: ...fuel tank with fresh 87 octane unleaded gasoline 3 Test replace fuel tank cap 4 Have qualified technician service magneto 5 Secure spark plug cap Engine stops when under heavy load 1 Dirty air filter...

Page 17: ...nition engines certified for model year 1997 and later must be designed built and equipped to meet the stringent anti smog standards set forth by the EPA HFT must warrant the emission control system o...

Page 18: ...y part which fails malfunctions or is damaged due to failure to follow the maintenance and operating instructions set forth in the Owner s Manual including but not limited to a Use of parts which are...

Page 19: ...800 520 0882 Vertical Engine Mounting Hole Diagram Note Not to scale A A 2 1 0 98 in 25mm 1 1 in 28mm 8mm A A A A 6 0 35 in 9mm 0 24 in 6mm 3 27 in 83mm 0 34 in 8 7mm 1 in 25 4mm 0 24 in 6mm 0 34 in...

Page 20: ...e Adjusting 2 55 Seat Valve Spring 2 56 Rocker Valve 2 57 Spring Valve 2 58 Guide Seal 1 59 Bolt Valve Adjusting 2 60 Valve Intake 1 Part Description Qty 61 Plate Asm Lifter Stopper 1 62 Lifter Valve...

Page 21: ...55 57 53 53 54 54 56 56 59 59 61 62 62 63 63 35 36 37 38 39 40 42 42 36 41 42 42 42 42 44 69 69 69 68 70 71 70 72 73 74 75 74 77 76 78 107 108 109 110 111 105 106 115 119 114 112 116 113 117 118 120...

Page 22: ...Piston 1 49 Rod Connecting 1 50 Crankshaft Asm 1 51 Nut Valve Lock 2 52 Nut Valve Adjusting 2 53 Seat Valve Spring 2 54 Rocker Valve 2 Part Description Qty 55 Spring Valve 2 56 Guide Seal 1 57 Bolt Va...

Page 23: ...45 47 64 62 63 55 58 56 53 53 55 51 51 52 52 54 54 57 57 59 60 60 61 61 33 34 35 36 37 38 40 40 34 39 40 40 40 40 42 67 67 67 66 68 69 68 70 71 72 73 72 75 74 76 96 97 98 99 100 94 95 104 108 103 101...

Page 24: ...3491 Mission Oaks Blvd PO Box 6009 Camarillo CA 93011 800 520 0882 www harborfreight com...

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