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. REV 15e 420cc Horizontal Engine Using an engine indoors CAN KILL YOU IN MINUTES.
Table of Contents Specifications.............................................. 2 Safety.......................................................... 3 Setup........................................................... 6 Operation..................................................... 9 Maintenance............................................... 14 Troubleshooting.......................................... 18 Warranties.................................................. 23 Parts List and Diagram......................
WARNING SYMBOLS AND DEFINITIONS This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death. Safety Indicates a hazardous situation which, if not avoided, will result in death or serious injury. Indicates a hazardous situation which, if not avoided, could result in death or serious injury. Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
Set up Precautions Safety 1. Gasoline fuel and fumes are flammable, and potentially explosive. Use proper fuel storage and handling procedures. Do not store fuel or other flammable materials nearby. 4. Set up and use only on a flat, level, well‑ventilated surface. 2. Have multiple ABC class fire extinguishers nearby. 6. Use only lubricants and fuel recommended in the Specifications chart of this manual. 3. Operation of this equipment may create sparks that can start fires around dry vegetation.
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, accessories, etc., in accordance with these instructions and in the manner intended for the particular type of equipment, taking into account the working conditions and the work to be performed. Use of the equipment for operations different from those intended could result in a hazardous situation. 24.
Set Up Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual including all text under subheadings therein before set up or use of this product. Safety TO PREVENT SERIOUS INJURY: Operate only with proper spark arrestor installed. Operation of this equipment may create sparks that can start fires around dry vegetation. A spark arrestor may be required. The operator should contact local fire agencies for laws or regulations relating to fire prevention requirements.
Engine Controls Fuel Cap Safety Air Filter Engine Switch Setup Starter Handle Muffler Throttle Dipstick Choke Fuel Valve Starter Operation Oil Drain Plug Serial Number Location ITEM 69736 For technical questions, please call 1-888-866-5797. Maintenance (Write on front cover of manual.
High Altitude Operation Above 3000 feet WARNING! TO PREVENT SERIOUS INJURY FROM FIRE: Follow instructions in a well-ventilated area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before proceeding. Do not smoke. Safety NOTICE Warranty void if necessary adjustments are not made for high altitude use.
Operation Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual including all text under subheadings therein before set up or use of this product. Safety Pre-Start Checks Inspect engine and equipment looking for damaged, loose, and missing parts before set up and starting. If any problems are found, do not use equipment until fixed properly.
Manual Start Safety 1. To start a cold engine, move the Choke to the CHOKE position. To restart a warm engine, leave the Choke in the RUN position. 1 CHOKE RUN 2. Open the Fuel Valve. 2 Setup OFF ON 3. Slide the Throttle or Speed Control Lever to 1/3 away from the SLOW position (the “turtle”). Note: Some tools have a Speed Control Lever located elsewhere on the tool which functions the same as the Throttle. Use the Speed Control Lever in place of the Throttle when the tool is so equipped.
6. Allow the Engine to run for several seconds. Then, if the Choke lever is in the CHOKE position, move the Choke Lever very slowly to its RUN position. Safety 6 Note: Moving the Choke Lever too fast could stall the engine. CHOKE RUN IMPORTANT: Allow the engine to run at no load for five minutes with no load after each start‑up so that the engine can stabilize. 7. Adjust the Throttle as needed. 8. Break-in Period: a. Breaking-in the engine will help to ensure proper equipment and engine operation.
Electric Start (if equipped) Safety 1. To start a cold engine, move the Choke to the CHOKE position. To restart a warm engine, leave the Choke in the RUN position. 1 CHOKE RUN Setup 2 2. Open the Fuel Valve. OFF ON 3. Slide the Throttle or Speed Control Lever to 1/3 away from the SLOW position (the “turtle”). Operation Note: Some tools have a Speed Control Lever located elsewhere on the tool which functions the same as the Throttle.
5. Allow the Engine to run for several seconds. Then, if the Choke lever is in the CHOKE position, move the Choke Lever very slowly to its RUN position. Note: Moving the Choke Lever too fast could stall the engine. Safety 5 CHOKE RUN IMPORTANT: Allow the engine to run at no load for five minutes with no load after each start‑up so that the engine can stabilize. 6. Adjust the Throttle as needed. 7. Break-in Period: a. Breaking-in the engine will help to ensure proper equipment and engine operation.
Maintenance WARNING Safety TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING: Turn the Power Switch of the equipment to its “OFF” position, wait for the engine to cool, and disconnect the spark plug cap before performing any inspection, maintenance, or cleaning procedures. TO PREVENT SERIOUS INJURY FROM EQUIPMENT FAILURE: Do not use damaged equipment. If abnormal noise, vibration, or excess smoking occurs, have the problem corrected before further use. Follow all service instructions in this manual.
Checking and Filling Fuel Engine Oil Change WARNING! TO PREVENT SERIOUS INJURY FROM FIRE: Fill the fuel tank in a well-ventilated area away from ignition sources. If the engine is hot from use, shut the engine off and wait for it to cool before adding fuel. Do not smoke. CAUTION! Oil is very hot during operation and can cause burns. Wait for engine to cool before changing oil. 1. Clean the Fuel Cap and the area around it. 4.
Air Filter Element Maintenance 1. Remove the air filter cover and the air filter elements and check for dirt. Clean as described below. 2. Cleaning: Safety • For “paper” filter elements: 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-ventilated area away from bystanders, use pressurized air to blow dust out of the air filter.
When the equipment is to remain idle for longer than 20 days, prepare the Engine for storage as follows: c. Replace spark plug, but leave spark plug cap disconnected. 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 of rust preventive oil to all metal parts. d. Pull Starter Handle to distribute oil in cylinder.
Troubleshooting Possible Causes Probable Solutions Engine will not start FUEL RELATED: 1. No fuel in tank or fuel valve closed. FUEL RELATED: 1. Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline and open fuel valve. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). 2. Move Choke to CHOKE position. Safety Problem 2. Choke not in CHOKE position, cold engine. 3. Gasoline with more than 10% ethanol used. (E15, E20, E85, etc.) 4.
1. Spark plug cap loose. 2. Incorrect spark plug gap or damaged spark plug. 3. Defective spark plug cap. 4. Old or low quality gasoline. 5. Incorrect compression. Engine stops suddenly 1. Low oil shutdown. 2. Fuel tank empty or full of impure or low quality gasoline. 3. Defective fuel tank cap creating vacuum, preventing proper fuel flow. 4. Faulty magneto. 5. Disconnected or improperly connected spark plug cap. 1. Check wire connections. 2. Re-gap or replace spark plug. 3.
Parts List and Diagram Parts List Safety Part Setup Operation Maintenance 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 Page 20 Description Gasket, Cylinder Head Cover Subassembly, Cylinder Head Gasket, Cylinder Head Cover Tube, Breather Bolt, Cylinder Head Washer Set Stud Stud Pin Bolt, Cylinder Head Plug, Spark Head Subassembly, Cylinder Crankcase Subassembly Seal, Oil Sensor, Engine Oil
Safety 35 35 35 32 35 35 35 35 78 38 53 30 63 60 64 59 59 55 39 36 37 44 71 75 10 10 33 43 10 10 47 48 42 11 58 74 8 34 45 8 31 46 12 43 34 7 49 7 27 1 40 9 15 27 Setup 82 54 60 52 61 61 9 41 50 26 51 57 57 86 87 88 26 20 26 21 16 56 56 26 87 85 89 84 29 89 13 83 14 25 28 24 23 77 76 99 22 100 100 21 20 17 97 98 97 97 97 96 18 19 Operation 80 79 81 81 2 62 62 76 94 106 104 95 93 103 105 92 102 101 91 69 68
Mounting Hole Diagram Note: Not to scale. 7.72 in. / 196mm 4.13 in. / 105mm Safety 3.39 in. / 86mm 4.06 in. / 103mm Setup Power Take-Off Diagram Note: Not to scale. Ø3.625 in. / 92mm (30°) (30°) 3.48 in. / 88.5mm 0.25 in. / 6.35mm Ø5.75 in. / 146mm 1.1 in. / 28mm 2.2 in. / 56mm 2.84 in. / 72.2mm 5.25 in. / 133.5mm Operation Ø5 in. / 127mm Ø1 in. / 25.4mm Ø1.17 in. / 29.7mm 0.36 in. / 9.13mm 3/8-24UNF Ø6.5 in. / 165.
Warranties To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise. If our inspection verifies the defect, we will either repair or replace the product at our election or we may elect to refund the purchase price if we cannot readily and quickly provide you with a replacement.
Harbor Freight Tools Emission Control Defects Warranty Provisions 1. Length of Coverage HFT warrants to a first retail purchaser and each subsequent purchaser that the engine is free from defects in materials and workmanship that cause the failure of warranted parts for a period of two (2) years after the date of delivery to the first retail purchaser. 2.