Owner's Manual Trimmer/Brush Cutter HHT25S • HHT31S EM3 31VJ4001 00X31-VJ4-0010 Printed on Recycled Paper POM53509A IPC 10000.2003.07 Printed in U.S.A. See page 42 for instructions on assembling your Trimmer. © 2002, 2003 American Honda Motor Co., Inc.
Keep this owner’s manual handy, so you can refer to it at any time. This owner’s manual is considered a permanent part of the trimmer/brush cutter and should remain with the trimmer/brush cutter if resold. The information and specifications included in this publication were in effect at the time of approval for printing. American Honda Motor Co., Inc. reserves the right, however, to discontinue or change specifications or design at any time without notice and without incurring any obligation whatever.
INTRODUCTION Congratulations on your selection of a Honda trimmer/brush cutter. We are certain you will be pleased with your purchase of one of the finest trimmer/brush cutters on the market. We want to help you get the best results from your new trimmer/brush cutter and to operate it safely. This manual contains the information on how to do that; please read it carefully. As you read this manual, you will find information preceded by a NOTICE symbol.
INTRODUCTION A FEW WORDS ABOUT SAFETY Your safety, and the safety of others, are very important. And using this trimmer/brush cutter safely is an important responsibility. To help you make informed decisions about safety, we have provided operating procedures and other information on labels and in this manual. This information alerts you to potential hazards that could hurt you or others.
CONTENTS TRIMMER SAFETY ................................................... 4 STORAGE................................................................. 49 RECOMMENDED CUTTING ATTACHMENTS ..... 7 TRANSPORTING .................................................... 51 TAKING CARE OF UNEXPECTED PROBLEMS ............................................................. 52 IMPORTANT SAFETY INFORMATION ..................... 4 ATTACHMENTS & MODIFICATIONS ....................... 5 IMPORTANT MESSAGE TO EMPLOYERS .......
TRIMMER SAFETY IMPORTANT SAFETY INFORMATION Turn the Engine Off When Not Trimming The Honda HHT25S and HHT31S trimmer/brush cutters are designed to cut grass, weeds, brush, and/or wood if equipped with an appropriate cutting attachment. Other uses can result in injury to the operator or damage to the trimmer and other property. If you stop trimming or cutting for any reason, even to clean off the cutting attachment, always shut off the engine.
TRIMMER SAFETY ATTACHMENTS & MODIFICATIONS IMPORTANT MESSAGE TO EMPLOYERS Modifying your trimmer/brush cutter, or installing non-Honda attachments, can make your trimmer unsafe. Before you make any modifications or install any attachments, be sure to read the following information. As an employer, you have special responsibilities to the people who work for you.
TRIMMER SAFETY SAFETY LABEL LOCATIONS The labels shown here contain important safety information. Please read them carefully. These labels are considered permanent parts of your trimmer/brush cutter. If a label comes off or becomes hard to read, contact an authorized Honda servicing dealer for a replacement.
RECOMMENDED CUTTING ATTACHMENTS CUTTING-LINE HEADS AND SHIELDS A cutting-line head containing nylon monofilament line, and a debris shield with cutoff knife is standard equipment. The shield’s cutoff knife automatically removes any excess line that is released from the cutting head. CUTTING-LINE HEAD NYLON MONOFILAMENT LINE Honda HHT31SUNBA model trimmers are supplied with two different debris shields. Use the debris shield with the cutoff knife when the cutting-line head is installed.
RECOMMENDED CUTTING ATTACHMENTS BLADES AND SHIELDS A variety of blades are available from your Honda trimmer servicing dealer. Always use a debris shield designed for use with a blade when attaching a blade to your trimmer. The blade type debris shield does not have a cutoff knife. DEBRIS SHIELDS BLADE CUTTING-LINE CUTOFF KNIFE GRASS/WEED BLADE, WEED/BRUSH BLADE (optional part) BRUSH/WOOD BLADE Honda HHT31SUNBA trimmers are supplied with a blade cover surrounding the edge of the blade.
RECOMMENDED CUTTING ATTACHMENTS Brush/Wood Blade Cover Installation and Removal BLADE 1. Install the blade cover over the blade so half the blade is covered. POST END DEBRIS SHIELD BLADE COVER To prevent the post end from interfering with the debris shield, pull the post end away from the blade and set it on top of the blade as shown. Turn the blade cover slowly until the post end clears the debris shield. 2. Reposition the post end over the blade. 3.
CONTROLS & EQUIPMENT COMPONENT & CONTROL LOCATIONS CUTTING-LINE HEAD GEAR CASE HHT25SLTA LOOP HANDLE HARNESS HANGER SPARK PLUG THROTTLE SET BUTTON Refer to page 37 for spark plug access.
CONTROLS & EQUIPMENT CONTROLS The location and operation of the controls are similar on both the HHT25S and HHT31S models. CHOKE LEVER CLOSED Choke Lever The choke lever opens and closes the choke valve. OPEN The CLOSED position enriches the fuel mixture for starting a cold engine. The OPEN position provides the correct fuel mixture for operation after starting, and for restarting a warm engine. U-type Handle: Ignition Switch STOP (O) The ignition switch controls the ignition system.
CONTROLS & EQUIPMENT Throttle Set Button The throttle set button is used to hold the throttle trigger at the fast idle position for starting. Do not allow the cutting line or blade to contact any obstruction when starting the engine with the throttle set button engaged.
CONTROLS & EQUIPMENT EQUIPMENT FULL SHOULDER HARNESS (UNBA only) The Honda HHT25S and HHT31S trimmer/brush cutters are supplied with a shoulder harness and safety glasses. Refer to page 14 for a description of other equipment and protective clothing you will need. Shoulder Harness A full shoulder harness must be worn by the operator of these Honda trimmers/brush cutters when equipped with a blade and debris shield.
BEFORE OPERATION ARE YOU READY TO OPERATE THE TRIMMER? Your safety is your responsibility. A little time spent in preparation will significantly reduce your risk of injury. Knowledge Read and understand this manual. Know what the controls do and how to operate them. Familiarize yourself with the trimmer and its operation before you begin to use it. Know what to do in case of emergencies. Physical and Mental Readiness You must be alert and in good physical condition to operate the trimmer.
BEFORE OPERATION IS YOUR TRIMMER READY TO GO? For your safety, and to maximize the service life of your equipment, it is very important to take a few moments before you operate the trimmer to check its condition. Be sure to take care of any problem you find, or have your servicing dealer correct it, before you operate the trimmer. WARNING Improperly maintaining this trimmer, or failing to correct a problem before operation, could cause a malfunction in which you could be seriously injured.
BEFORE OPERATION ARE YOUR SHOULDER HARNESS AND TRIMMER CORRECTLY ADJUSTED? Adjusting the Harness Adjust the harness so the quick-release latch is at your right hip, as shown. Balancing the Trimmer on the Shoulder Harness Hang the trimmer on the harness hook, and see how it balances.
OPERATION SAFE OPERATING PRECAUTIONS Before operating the trimmer for the first time, please review the IMPORTANT SAFETY INFORMATION chapter on page 4 and BEFORE OPERATION chapter starting on page 14. Even if you have operated other trimmers, take time to become familiar with the operation of this trimmer’s controls and handling. For your safety, avoid starting or operating the engine in an enclosed area, such as a garage.
OPERATION 5. Set the trimmer on the ground, resting on the debris shield and the fuel tank guard. Do not allow the cutting-line or blade to contact any obstruction. Always rest the trimmer on the ground for starting, rather than holding it in the operating position. This prevents the end of the trimmer from swinging into something as you start the engine. 6. With your left hand, hold the frame pipe just ahead of the engine.
OPERATION STOPPING THE ENGINE 1. Release the throttle trigger. 2. Move the ignition switch to the STOP (O) position. Wait for the cutting line head or blade to stop before allowing the end of the trimmer to contact anything. THROTTLE TRIGGER STOP (O) IGNITION SWITCH WARNING The blade will continue to spin briefly after the engine has stopped or the throttle trigger is released. LATCH TAB A coasting blade can cause injury.
OPERATION Throttle Operation Pull the throttle trigger toward the grip to increase engine speed and start cutting attachment rotation. The trimmer has the greatest cutting force at maximum engine speed. THROTTLE TRIGGER Release the throttle trigger to reduce engine speed. At idle, the cutting attachment should coast to a stop. Using a Nylon Cutting-Line Head As the ends of the line wear away, more line must be released from the cutting-line head.
OPERATION Using Blades Thrown Debris Refer to the chart on page 9 for appropriate blade applications. The trimmer will throw debris in the direction of blade movement at the point of contact. If using a blade on a Honda trimmer equipped with a loop handle, also install the optional Honda conversion kit that includes a full shoulder harness, a barrier bar, and a debris shield for blades. Follow the installation instructions and safety information that come with the kit.
OPERATION Blade Thrust (Kickback) Blade thrust (kickback) is the sudden, forceful, and uncontrolled movement of a blade-equipped trimmer that may occur if the blade binds in the cut or strikes a solid object. BLADE THRUST Blade thrust (kickback) throws the trimmer in the direction opposite blade rotation at the point of contact, and the jolt received by the operator can result in further loss of control.
OPERATION Trimming and Edging Use nylon line for cutting against a hard surface. Work from an angle where debris that strikes the hard surface will ricochet away from you. DEBRIS Avoid contact with wires, wire fences, metal rods, etc. Overlapping a wire will cause the nylon line to wrap around the wire and break off. Brush Clearing Clearing brush with a brush blade may require both scything and sawing. TRIMMING Scything with the right side of the blade will direct thrown debris away from you.
SERVICING YOUR HONDA TRIMMER THE IMPORTANCE OF MAINTENANCE MAINTENANCE SAFETY Good maintenance is essential for safe, economical, and trouble-free operation. It will also help reduce air pollution. Some of the most important safety precautions follow. However, we cannot warn you of every conceivable hazard that can arise in performing maintenance. Only you can decide whether or not you should perform a given task.
SERVICING YOUR HONDA TRIMMER MAINTENANCE SCHEDULE Every First Every Every Every 2 years Before or month 3 months 6 months year each Perform at every indicated or or or or after use month or operating hour 10 Hrs 25 Hrs 50 Hrs 100 Hrs each interval, whichever comes first.
SERVICING YOUR HONDA TRIMMER ENGINE Engine Oil Level Check Check the engine oil level before each use, or every 10 hours if operated continuously. Rest the trimmer on a level surface, with the engine stopped and in an upright position. 1. Remove the filler cap/dipstick and wipe it clean. 2. Insert and remove the dipstick without screwing it into the filler opening. Check the oil level shown on the dipstick. 3.
SERVICING YOUR HONDA TRIMMER Engine Oil Recommendations Oil is a major factor affecting performance and service life. Use 4-stroke automotive detergent oil. SAE 10W-30 is recommended for all temperatures within the recommended operating range for these trimmers. The recommended operating range extends from 23°F (-5°C) to 104°F (40°C). The SAE oil viscosity and service classification are on the API label on the oil container. Honda recommends that you use API SERVICE category SJ or SL oil.
SERVICING YOUR HONDA TRIMMER Throttle Cable Inspection Verify the throttle trigger operates smoothly and the throttle cable is undamaged. If there is visible damage, or if the throttle trigger does not operate smoothly, have your authorized Honda servicing dealer replace the throttle cable. Check the free play at the end of the throttle cable. Free play (all models): 1/16 ~ 1/8 in (1.0 ~ 3.0 mm) If adjustment is needed, use the following cable adjustment procedure. Throttle Cable Adjustment 1.
SERVICING YOUR HONDA TRIMMER CUTTING ATTACHMENTS Installing Replacement Nylon Line There are several cutting attachments for your trimmer. Use the following section to inspect, remove, service and install a standard (factoryinstalled) cutting attachment. First, determine which cutting-line head style is on your trimmer. A manual-feed trimmer head has a three-sided knob on the bottom of the head, while the semi-matic head has a springloaded round button on the bottom of the head.
SERVICING YOUR HONDA TRIMMER Manual Cutting-Line Head 1. Clean any mud, dirt, debris, etc. from the area around the trimmer head; otherwise, it will make it more difficult to service. 2. Rotate the left-hand threaded knob in the direction of the arrow and remove the knob. Remove the spring and spool from the housing then remove any remaining old line from the spool. HOUSING SHAFT SPOOL SPRING KNOB (left-hand thread) 3.
SERVICING YOUR HONDA TRIMMER 5. When you have about 6 inches (150 mm) of line remaining, press the lines into the two notches on the bottom of the spool. This will hold the lines on the spool for reassembly. NOTCHES 6. Feed both line ends through the metal eyelets in the housing. Be careful not to let the line slip under the spool. When the spool reaches the bottom of the housing, the lines should snap out of the spool notches.
SERVICING YOUR HONDA TRIMMER Semi-Matic (Bump-Feed) Cutting-Line Head SPOOL 1. Clean any mud, dirt, debris, etc., from around the trimmer head area; otherwise, it will make it more difficult to service. 2. Locate the half-round locking hole on the spool. HALF-ROUND LOCKING HOLE 3. It may be necessary to lightly rotate the spool in the direction of the arrow about an 1/8 turn until the spool stops. 4.
SERVICING YOUR HONDA TRIMMER 7. Wind both lines tightly and evenly from side to side ignoring the ridge. Feed the line while turning the spool in the direction of the arrow. Do not allow the line to get twisted. It is important to prevent the two lines from getting twisting over each other. Position a finger between the lines as you turn the spool to prevent the lines from twisting. 8. When you have about 6 inches (150 mm) of line remaining, press the lines into the two notches on the bottom of the spool.
SERVICING YOUR HONDA TRIMMER Removal & Installation This section shows you how to remove and install either style trimmer head from your trimmer. REMOVAL DIRECTION 1. Insert the tip of a commercially available 4 mm hex wrench or equivalent fully into the gear case hole. 2. Turn the trimmer cutting-line head until you feel the tool drop into the hole in cover plate/ spacer A. Verify the trimmer head does not turn. 3. All output shafts use left-hand threads.
SERVICING YOUR HONDA TRIMMER Blade Blade Inspection Always wear gloves when working around the blade. Before each use, check the blade for wear and damage, and check the tightness of the blade lock nut. Examine the entire head area, including the debris shield, and clear or clean it free from dirt, debris, loose string, wire, or any other foreign materials. WARNING A worn, damaged or cracked blade can break, and pieces of the damaged blade can become dangerous projectiles.
SERVICING YOUR HONDA TRIMMER 1. Install the protective plastic cover, that came with the blade, back on the blade. 2. Insert a commercially available 4 mm hex tool or equivalent fully into the gear case hole. 3. Turn the blade until you feel the tool drop into the hole in cover plate/spacer A. Verify the blade does not turn. The output shaft and blade lock nut have a left-hand thread. Make sure the tool remains in the hole, then loosen the blade nut as shown.
SERVICING YOUR HONDA TRIMMER Spark Plug Service SPARK PLUG Recommended spark plugs: HHT25S CMR5HSB (NGK) HHT31S CR5HSB (NGK) U16FSR-UB (DENSO) HHT31S NOTICE Incorrect spark plugs can cause engine damage. 1. HHT25S model: Remove the 5 x 12 mm hex bolt and top cover. 2. Disconnect the spark plug cap, and remove any dirt from around the spark plug area. 3. Remove the spark plug with a 5/8-inch spark plug wrench. 4. Inspect the spark plug.
SERVICING YOUR HONDA TRIMMER Spark Arrester Service RECOIL STARTER HHT31S The spark arrester must be serviced every 100 hours to keep it functioning as designed. If the engine has been running, the muffler will be very hot. Allow the muffler to cool before servicing the spark arrester. 1. Remove the four 5 x 18 mm bolts from the recoil starter, and remove the recoil starter. 2. Disconnect the spark plug cap from the spark plug.
SERVICING YOUR HONDA TRIMMER HHT25S The spark arrester must be serviced every 100 hours to keep it functioning as designed. 5/32 in (4 mm) HEX WRENCH (commercially available) If the engine has been running, the muffler will be very hot. Allow the muffler to cool before servicing the spark arrester. 5 x 12 mm HEX BOLT 1. Remove the 5 x 12 mm hex bolt and top cover 2. Remove the two 4 x 6 mm self-tapping screws from the spark arrester, and remove the spark arrester from the muffler. TOP COVER 3.
SERVICING YOUR HONDA TRIMMER FUEL SYSTEM Refueling Fuel tank capacities: HHT25S: 0.53 qt/16.9 fl oz (0.50 ) HHT31S: 0.69 qt/22.0 fl oz (0.65 ) Check the fuel level by looking through the translucent fuel tank. If the fuel level is low, refuel in a well-ventilated area with the engine stopped. If the engine has been running, allow it to cool first. To refuel, rest the trimmer on the ground with the fuel tank cap facing up, as shown.
SERVICING YOUR HONDA TRIMMER Fuel Filter and Fuel Tank Cleaning 1. Remove the fuel tank cap, and empty the fuel tank into an approved gasoline container. Use a funnel to avoid spilling gasoline. 2. Pull the fuel filter out through the fuel filler neck by hooking the black fuel supply tube with a piece of wire, such as a partly straightened paper clip. 3. Inspect the fuel filter. If the fuel filter is dirty, remove it and wash it with nonflammable solvent. Be careful to avoid damaging the filter.
ASSEMBLY After assembly and before operation review the Safe Operating Precautions on page 17. IMPORTANCE OF PROPER ASSEMBLY Proper assembly is essential to operator safety and the reliability of the machine. Any error or oversight made by the person assembling and servicing a machine can result in faulty operation, damage to the machine, or injury to the operator. Some of the most important safety precautions are given below.
ASSEMBLY UNPACKING Carefully remove the trimmer and loose parts from the carton and compare the loose parts with the inventory list below. Tools Required (UNBA types only): A 4 mm hex wrench, 8 and 17 mm sockets, 0 to 25 ft-lb torque wrench. LOOSE PARTS Check all loose parts against the following list. Contact your authorized Honda servicing dealer if any of the loose parts shown are not included with your trimmer. Ref.
ASSEMBLY TRIMMER ASSEMBLY (UNBA types only) U-Shaped Handlebar Installation 1. Remove the four 5 x 28 mm bolt/washers and handlebar holder A. THROTTLE TRIGGER 5 x 28 mm BOLT/ WASHER(4) 2. Set the U-shaped handle into handlebar holder B with the throttle trigger facing to the right. HANDLEBAR HOLDER A U-SHAPED HANDLEBAR HANDLEBAR HOLDER B 3. Adjust the handlebar position as shown. 90° 4. Tighten the four 5 x 28 mm bolt/washers. TORQUE: 3.6 ft lb (5 N·m, 0.5 kg-m) 5.
ASSEMBLY Saw Blade The UNBA types are shipped with a manual nylon cutting-line head installed on the trimmer. If the saw blade is needed, move the ignition switch to the STOP (O) position and disconnect the spark plug cap from the spark plug. Wear protective gloves when working around the cutting-line head and saw blade. Cutting-Line Head Removal CUTTING-LINE HEAD ASSEMBLY 1. Align the gear case hole with the groove in cover plate/spacer A.
ASSEMBLY Saw Blade Installation 1. Insert a 4 mm hex wrench or equivalent into the gear case hole to prevent the output shaft from turning. TIGHTEN COVER 2. Install cover plate/spacer A onto the output shaft as shown. SPACER B BLADE 10 mm LOCK NUT (left-hand thread) Install with the white markings facing the debris shield. 3. With the blade cover installed on the blade, install the blade, by aligning the center of the blade with the shoulder on cover plate/spacer A. BLADE COVER 4.
ASSEMBLY BLADE COVER REMOVAL 1. Turn the blade cover slowly until the cover latch is clear of the debris shield. Unfasten the latch by lifting the tab off the post. POST 1 TAB 2 2. Pull the post end away from the blade and set it on top of the blade as shown. BLADE COVER 3 POST END POST END 3. Turn the blade cover slowly until the post end is clear of the debris shield, then remove the blade cover from the blade. BLADE COVER INSTALLATION 1.
ASSEMBLY ENGINE OIL 1. Working on a level surface, remove the oil filler cap/dipstick. HHT31S FILLER CAP/DIPSTICK FILLER OPENING 2. Slowly add the recommended oil (included in the box) to the bottom edge of the oil fill hole. Do not overfill, as the engine oil tank capacity is small. HHT25S Engine oil capacity: HHT25S 2.7 fl oz (80 cc) HHT31S 3.4 fl oz (100 cc) NOTICE Running the engine with too little or too much oil can cause engine damage. 3. Screw in the oil filler cap/dipstick securely.
STORAGE STORAGE PREPARATION Fuel Proper storage preparation is essential to keep your trimmer trouble free and looking good. The following steps will help to keep rust and corrosion from impairing your trimmer's function and appearance, and will make the engine easier to start when you use the trimmer again. Gasoline will oxidize and deteriorate in storage. Old gasoline will cause hard starting, and it leaves gum deposits that clog the fuel system.
STORAGE Adding Fuel Stabilizer to Extend Fuel Storage Life When adding a fuel stabilizer, fill the fuel tank with fresh gasoline. If only partially filled, air in the tank will promote fuel deterioration during storage. If you keep a container of gasoline for refueling, be sure that it contains only fresh gasoline. Add fuel stabilizer following the manufacturer's instructions.
TRANSPORTING BEFORE LOADING If the engine has been running, allow it to cool for at least 15 minutes before loading the trimmer on the transport vehicle. A hot engine and exhaust system can burn you and can ignite some materials. Always turn the ignition switch to the STOP (O) position. Make sure the fuel cap is securely tightened. LOADING The trimmer may be secured by suitable clamps, hangers or straps. Secure the trimmer by at least two points along the frame pipe.
TAKING CARE OF UNEXPECTED PROBLEMS STARTING PROBLEMS Engine Will Not Start Possible Cause Correction Check control positions. Ignition switch STOP (O). Turn ignition switch ON (I). Choke not in CLOSED (cold engine). Move choke to the CLOSED position. Out of fuel. Add fuel and press priming bulb to fill carburetor. Bad fuel, trimmer stored without treating or draining gasoline, refueled with bad gasoline. Drain fuel tank and carburetor, refuel with fresh gasoline. Remove spark plug.
TAKING CARE OF UNEXPECTED PROBLEMS CUTTING HEAD PROBLEMS Blade or Cutting-line head Won’t Stop Turning When Throttle is at SLOW Position Possible Cause Correction Check throttle control and cable. Fault in throttle control or cable; throttle cable out of adjustment or bent. Check throttle control parts, adjust or replace cable if necessary. Idle speed is too fast. Adjust idle speed. Check clutch. Clutch springs broken or worn, or clutch system faulty.
TECHNICAL & CONSUMER INFORMATION TECHNICAL INFORMATION This chapter contains important information about serial number locations, high altitude operation, oxygenated fuels, and emissions control systems. Serial Number Locations There are two serial numbers, one for the trimmer and one for the engine. Record these numbers in the space provided. You will need to have these numbers available when ordering parts or making technical or warranty inquiries (page 60).
TECHNICAL & CONSUMER INFORMATION Oxygenated Fuels Some conventional gasolines are being blended with alcohol or an ether compound. These gasolines are collectively referred to as oxygenated fuels. To meet clean air standards, some areas of the USA and Canada use oxygenated fuels to help reduce emissions. If you use an oxygenated fuel, be sure it is unleaded and meets the minimum octane rating requirement. Before using an oxygenated fuel, try to confirm the fuel's contents.
TECHNICAL & CONSUMER INFORMATION Emissions Control System Information Problems That May Affect Emissions Source of Emissions If you are aware of any of the following symptoms, have your engine inspected and repaired by your servicing dealer. The combustion process produces carbon monoxide, oxides of nitrogen, and hydrocarbons. Control of hydrocarbons and oxides of nitrogen is very important because, under certain conditions, they react to form photochemical smog when subjected to sunlight.
TECHNICAL & CONSUMER INFORMATION Air Index An Air Index Information hang tag/label is applied to engines certified to an emission durability time period in accordance with the requirements of the California Air Resources Board. The bar graph is intended to provide you, our customer, the ability to compare the emissions performance of available engines. The lower the Air Index, the less pollution.
TECHNICAL & CONSUMER INFORMATION Specifications FEATURES HHT25S HHT31S HHT31SUNBA • • • • GX25 1.1 hp GX31 1.5 hp • Loop handle • U-type handle Manual feed head Semi-matic feed head Saw blade optional optional • • • optional optional (requires optional Barrier Kit) optional (requires optional Barrier Kit) • DIMENSIONS Handle Installed Length Loop U-type1 Width Height Dry weight 1with 58 HHT25S HHT31S Manual feed head — 6.15 feet (1.875 m) Semi-matic feed head 6.12 feet (1.
TECHNICAL & CONSUMER INFORMATION ENGINE Model Engine type Displacement Bore & stroke Maximum output Maximum torque Ignition system Spark plugs Starting system Fuel Fuel tank capacity Fuel consumption Oil capacity Carburetor type Air cleaner Idle speed HHT25S HHT31S GX25 GX31 4-stroke, overhead-cam, single-cylinder 4-stroke, overhead-valve, single-cylinder 1.5 cu in (25 cc) 1.9 cu in (31 cc) 1.4 x 1.0 in (35 x 26 mm) 1.5 x 1.0 in (39 x 26 mm) 1.1 hp (0.82 kW) at 7,000 rpm 1.5 hp (1.1 kW) at 7,000 rpm 0.
TECHNICAL & CONSUMER INFORMATION CONSUMER INFORMATION Honda Publications Dealer Locator Information Three other documents are available from your Honda dealer. There is a shop manual and shop manual supplement, which covers complete maintenance and overhaul procedures. It is intended to be used by a skilled technician. There is also a parts catalog that provides a complete, illustrated parts list. To find an Authorized Honda Servicing Dealer anywhere in the United States: Visit our website: www.
INDEX A E Air Filter Check ........................................................ 27 Cleaning .................................................... 27 Air Index.......................................................... 57 Assembly ........................................................ 42 Loose Parts ............................................... 43 Trimmer Assembly (UNBA types only)...... 44 Unpacking ................................................. 43 Emission Control System........................
INDEX M S Maintenance Air Filter ..................................................... 27 Engine Oil.................................................. 26 Fuel System .............................................. 40 Importance ................................................ 24 Safety ........................................................ 24 Schedule ................................................... 25 Spark Arrester ........................................... 38 Spark Plug............................
QUICK REFERENCE INFORMATION HHT25S Fuel Engine oil Spark plug Carburetor HHT31S Type Unleaded gasoline with a pump octane rating of 86 or higher (page 40) Capacity 0.53 qt/16.9 fl oz (0.50l) Type SAE 10W-30, API SJ or SL (page 27) Capacity 2.71 fl oz (80 cc) 3.4 fl oz (100 cc) Type NGK: CMR5H NGK: CR5HSB DENSO: U16FSR-UB Electrode gap 0.024 – 0.028 in (0.60 – 0.
Owner's Manual Trimmer/Brush Cutter HHT25S • HHT31S EM3 31VJ4001 00X31-VJ4-0010 Printed on Recycled Paper POM53509A IPC 10000.2003.07 Printed in U.S.A. See page 42 for instructions on assembling your Trimmer. © 2002, 2003 American Honda Motor Co., Inc.
