Page 1: Table Of Contents
INTRODUCTION Thank you for purchasing a Honda engine. We want to help you to get the best results from your new engine and to operate it safely. This manual contains information on how to do that; please read it OWNER’S MANUAL carefully before operating the engine.
Page 2: Safety Information
RECOIL STARTER This label warns you of potential hazards that can cause serious MUFFLER injury. Read it carefully. If the label comes off or becomes hard to read, contact your Honda dealer for replacement. SPARK PLUG STARTER GRIP For Canadian types only:...
Page 3: Features
FEATURES BEFORE OPERATION CHECKS OIL ALERT SYSTEM (applicable types) IS YOUR ENGINE READY TO GO? The Oil Alert system is designed to prevent engine damage caused by an insufficient amount of oil in the crankcase. Before For your safety, and to maximize the service life of your the oil level in the crankcase can fall below a safe limit, the Oil equipment, it is very important to take a few moments before you Alert system will automatically stop the engine (the engine...
Page 4: Operation
OPERATION Turn the engine switch to the ON position. EXCEPT ELECTRIC ELECTRIC STARTER TYPES SAFE OPERATING PRECAUTIONS STARTER TYPES Before operating the engine for the first time, please review the SAFETY INFORMATION section on page and the BEFORE OPERATION CHECKS on page . ENGINE SWITCH Carbon monoxide gas is toxic.
Page 5: Stopping The Engine
Operate the starter. STOPPING THE ENGINE RECOIL STARTER: To stop the engine in an emergency, simply turn the engine switch to the OFF position. Under normal conditions, use the following Pull the starter grip lightly until you feel resistance, then pull procedure.
Page 6: Setting Engine Speed
SETTING ENGINE SPEED Position the throttle lever for the desired engine speed. Some engine applications use a remote-mounted throttle control rather than the engine-mounted throttle lever shown here. Refer to the instructions provided by the equipment manufacturer. For engine speed recommendations, refer to the instructions provided with the equipment powered by this engine.
Page 7: Servicing Your Engine
Let the engine and exhaust system cool before touching. proficient. Refer to Honda shop manual for service procedures. Injury from moving parts. Do not run the engine unless instructed to do so.
Page 8: Refueling
If spark knock or pinging shown in the chart may be used when the average temperature in persists, see an authorized Honda servicing dealer. your area is within the indicated range. Running the engine with persistent spark knock or pinging can cause engine damage.
Page 9: Oil Level Check
Oil Level Check Install the oil filler cap/dipstick and tighten securely. OIL FILLER CAP/ Check the engine oil level with the engine stopped and in a level DIPSTICK position. Remove the oil filler cap/dipstick and wipe it clean. Insert the oil filler cap/dipstick into the oil filler neck as shown, WASHER but do not screw it in, then remove it to check the oil level.
Page 10: Oil Change
6 : 1 Reduction Case 6 : 1 Reduction Case OIL LEVEL FILLER BOLT Remove the oil-level-check bolt Drain the used oil while the engine is warm. Warm oil drains and washer, and see whether the quickly and completely. oil level is at the edge of the bolt hole.
Page 11: Cleaning
Cleaning Wipe dirt from the inside of the air cleaner case and cover, using STANDARD DUAL-FILTER- ELEMENT TYPE a moist rag. Be careful to prevent dirt from entering the air duct Dual-Filter-Element Types that leads to the carburetor. WING NUT Remove the wing nut from AIR CLEANER Place the foam air filter element over the paper element, and...
Page 12: Sediment Cup
Low Profile Types Move the fuel valve to the ON position, and check for leaks. CLIP AIR CLEANER COVER Replace the O-ring if there is any leakage. Unsnap the air cleaner cover clips, remove the air cleaner SPARK PLUG cover, and remove the air filter element.
Page 13: Spark Arrester
Check local laws and regulations. A spark Storage Preparation arrester is available from authorized Honda servicing dealers. Proper storage preparation is essential for keeping your engine trouble-free and looking good. The following steps will help to The spark arrester must be serviced every 100 hours to keep it keep rust and corrosion from impairing your engine’s function and...
Page 14: Transporting
Draining the Fuel Tank and Carburetor Storage Precautions If your engine will be stored with gasoline in the fuel tank and carburetor, it is important to reduce the hazard of gasoline vapor ignition. Select a well-ventilated storage area away from any Gasoline is highly flammable and explosive, and you appliance that operates with a flame, such as a furnace, water can be burned or seriously injured when handling...
Page 15: Taking Care Of Unexpected Problems
Frequent fuse failure usually indicates a short circuit or an Honda carburetor as necessary. overload in the electrical system. If the fuse burns out frequently, servicing malfunction, take the engine to a servicing Honda dealer for repair. dealer, or refer ignition to shop malfunction, manual. valves stuck, etc.
Page 16: Technical & Consumer
TECHNICAL & CONSUMER INFORMATION Remote Control Linkage TECHNICAL INFORMATION The throttle and choke control levers are provided with holes for optional cable attachment. The following illustrations show Serial Number Location installation examples for a solid wire cable and for a flexible, Record the engine serial braided wire cable.
Page 17: Oxygenated Fuels
United States and Canada use oxygenated fuels to help reduce emissions. The following instructions and procedures must be followed in order to keep the emissions from your Honda engine within the If you use oxygenated fuel, be sure it is unleaded and meets the emission standards.
Page 18: Specifications
Air Index Specifications An Air Index Information hang tag/label is applied to engines GX120 (PTO shaft type S) certified to an emission durability time period in accordance with Length Width 318 mm the requirements of the California Air Resources Board.
Page 19: Quick Reference
Quick Reference Information Wiring Diagrams Fuel Unleaded gasoline (Refer to page 8) With Oil Alert and Electric Starter U.S. Pump octane rating 86 or higher Except Research octane rating 91 or higher U.S. Pump octane rating 86 or higher Engine oil SAE 10W-30, API SJ or SL, for general use.
Page 20: Consumer Information
If you are dissatisfied with the decision made by the dealership’s All Other Areas: management, contact the Honda Regional Engine Distributor for Please contact the Honda distributor in your area for assistance. your area. If you are still dissatisfied after speaking with the Regional Engine Distributor, you may contact the Honda Office as shown.

This manual is also suitable for:

Gx160 Gx200

Honda GX120 Owner's Manual

Quick Links

INTRODUCTION

SAFETY MESSAGES

Related Manuals for Honda GX120

Summary of Contents for Honda GX120

This manual is also suitable for:

Table of Contents