Honda HHT25S Owner'S Manual Download Page 9

9

Add Fuel

This engine is certified to operate on regular gasoline with a pump 
octane rating of 86 or higher.

Never use stale or contaminated gasoline or an oil/gasoline mixture. 
Avoid getting dirt or water in the fuel tank.

You may use regular unleaded gasoline containing no more than 10% 
ethanol (E10) or 5% methanol by volume. In addition, methanol must 
contain cosolvents and corrosion inhibitors.

Use of fuels with content of ethanol or methanol greater than shown 
above may cause starting and/or performance problems. It may also 
damage metal, rubber, and plastic parts of the fuel system.

Engine damage or performance problems that result form using a fuel 
with percentages of ethanol or methanol greater than shown above 
are not covered under warranty.

NOTICE

If your equipment will be used on an infrequent or intermittent basis, 
(more than 4 weeks before next use), refer to “AVOIDING 
FUEL-RELATED PROBLEMS” on 

page 28

 for information regarding 

fuel deterioration.

1. To refuel, set the trimmer on level ground and remove the fuel 

tank cap. 

2. Fill the tank with gasoline to the shoulder of the filler neck. 
3. Refuel carefully to avoid spilling fuel. Do not overfill.
4. After refueling, tighten the fuel tank cap securely.

Never refuel the engine inside a building where gasoline fumes 
may reach flames or sparks. Keep gasoline away from appliance 
pilot lights, barbecues, electric appliances, power tools, etc.
Spilled fuel is not only a fire hazard, it causes environmental 
damage. Wipe up spills immediately
Move the trimmer at least 10 feet (3 meters) away from the 
fueling source and site before starting the engine.

NOTICE

Fuel can damage paint and plastic. Be careful not to spill fuel 
when filling your fuel tank. Damage caused by spilled fuel is not 
covered by the 

DISTRIBUTOR’S LIMITED WARRANTY

 

(

page 30

).

OPERATION

For your safety, avoid starting or operating the engine in an enclosed 
area, such as a garage. Your trimmers exhaust contains poisonous 
carbon monoxide gas, which can collect rapidly in an enclosed area 
and cause illness or death.

If the trimmer starts to shake or vibrate, stop the engine immediately. 
After the cutting head has completely stopped, inspect it to determine 
the cause of the vibration. Sudden vibration is a sign of a hazardous 
problem, such as a loose or damaged blade. Do not operate the 
trimmer until the problem is corrected.

Prolonged exposure to vibration may cause Hand-Arm Vibration 
Syndrome (HAVS). Symptoms include loss of skin color in the hands 
and numbness or a painful tingling sensation in the fingers, hands, 
and arms. Regular users of any power equipment may feel the 
numbness or pain spontaneously, at any time, not just after using the 
equipment. If any of these symptoms occur, see a physician 
immediately.

Safe Trimming Practices

Honda trimmers are designed to give safe and dependable service if 
operated according to instructions and intended use.
Honda trimmers are intended to be used by an experienced, trained 
operator who is familiar with the use of power equipment. Do not allow 
a child or an inexperienced, untrained operator to use this trimmer. 
Operating this equipment requires special effort on your part to 
ensure your safety and the safety of others. Read and understand this 
owner’s manual.

Always Wear Eye Protection and Protective Clothing

• The most frequent injuries associated with string trimmers are eye 

injuries caused by thrown debris. Always wear safety glasses or 
goggles that meet the ANSI Z87.1 rating whenever you use the 
trimmer.

• The operator must wear hearing protectors when using this 

trimmer. Hearing protectors will protect the operator's ears from 
noise damage.

• Wearing protective clothing also reduces the risk and severity of 

injury from thrown debris or contact with the cutting attachment. 
Wear the trimmer harness, gloves, a long-sleeved shirt, long pants, 
and sturdy boots with nonslip soles.

Keep Away From Cutting Lines and Blades

• A spinning cutting blade can cut through your clothes and skin just 

as easily as it cuts through grass and dirt. Keep all parts of your 
body away from a spinning cutting attachment.

• Even after the engine has stopped, the cutting attachment will spin 

for several seconds. Do not touch it until it has stopped spinning, or 
you may get cut.

WARNING

Gasoline is highly flammable and explosive, and you can be 
burned or seriously injured when refueling.

• Stop the engine and let cool before refueling.
• Keep heat, sparks, and flame away.
• Refuel only outdoors.
• Wipe up spills immediately.

FUEL 
TANK CAP

MAXIMUM
FUEL 
LEVEL

FUEL 
TANK

WARNING

Exhaust contains poisonous carbon monoxide gas that can 
build up to dangerous levels in closed areas. 

Breathing carbon monoxide can cause unconsciousness or 
death.

Never run the trimmer in a closed, or even partially closed 
area where people may be present.

Summary of Contents for HHT25S

Page 1: ...ebris Shields 21 Cutting Line Heads 22 TRANSPORTING 24 Before Loading 24 Loading 24 STORAGE 24 Fuel 24 Oil 24 Cleaning 24 Storage Location 25 Removing From Storage 25 TROUBLESHOOTING 25 Engine Will No...

Page 2: ...esigned 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 These Honda...

Page 3: ...S HANGER DEBRIS SHIELD WITH CUTOFF KNIFE DRIVE CABLE FRAME PIPE LOOP HANDLE THROTTLE SET BUTTON OPERATOR PRESENCE LEVER THROTTLE TRIGGER IGNITION SWITCH CUTTING LINE HEAD GEAR CASE GEAR CASE IGNITION...

Page 4: ...trigger facing to the right 3 Adjust the handlebar position as shown WARNING Improper assembly can cause an unsafe condition that can lead to serious injury or death Follow the procedures and precauti...

Page 5: ...mmer head and tighten it by hand in the direction shown 7 Remove the 4 mm hex wrench from the gear case hole All output shafts use left hand threads Brush Wood 50 tooth Shield and Head Installation Pr...

Page 6: ...th the blade cover fully seated on the blade latch the tab over the post Add Engine Oil The trimmer is shipped WITHOUT OIL in the engine Place the trimmer on a level surface and then remove the oil fi...

Page 7: ...ting the trimmer carefully inspect the area and remove all objects that could be thrown by or entangled in the cutting attachment such as rocks broken glass nails wire or string Clear the area of chil...

Page 8: ...he trimmer on a level surface with the engine stopped 1 Rest the trimmer on a level surface as shown 2 Remove the oil filler cap dipstick and wipe it clean 3 Insert and remove the dipstick without scr...

Page 9: ...Do not operate the trimmer until the problem is corrected Prolonged exposure to vibration may cause Hand Arm Vibration Syndrome HAVS Symptoms include loss of skin color in the hands and numbness or a...

Page 10: ...ebris that strikes the hard surface will ricochet away from you Gravel loose stones etc can be picked up by the nylon cutting lines or blade and thrown many feet with enough force to cause serious per...

Page 11: ...rub or sapling away to free the blade Do not use the blade as a lever Operation on Slopes Start on the low side of a slope and work upward This will reduce your risk of slipping and falling and it wil...

Page 12: ...rottle 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 thrott...

Page 13: ...resistance then pull briskly Return the starter grip gently 7 If the choke lever was moved to the CLOSED position to start the engine gradually move it to the OPEN position as the engine warms up All...

Page 14: ...1 4 inch 6 mm exposed in the inner housing radius Do this for both sides The line will only move in one direction Pull the trimmer line through the inner housing to unload Semi Matic bump feed Cuttin...

Page 15: ...be careful when working around gasoline Use only a nonflammable solvent not gasoline to clean parts Keep cigarettes sparks and flames away from all fuel related parts Maintenance Schedule 1 Log the h...

Page 16: ...lean the filter more often when used in dusty areas Replace the filter every 2 years or 150 hours of use A properly maintained air filter will help prevent dirt from entering your engine Dirt entering...

Page 17: ...lace the spark plug every 2 years or after 300 hours of use Required Spark Plug NGK CMR5H NOTICE An incorrect spark plug can cause engine damage 1 Use a 4 mm Allen wrench to loosen the 5 x 12 mm hex b...

Page 18: ...ng fins 3 Install the fan cover and tighten the 5 mm hex bolt securely Throttle Cable Inspection Verify the throttle trigger operates smoothly releases properly and the throttle cable is undamaged If...

Page 19: ...r If the fuel filter is dirty wash it with nonflammable solvent Be careful to avoid damaging the filter 5 Replace the filter if it is damaged or excessively dirty 6 Rinse sediment from the fuel tank w...

Page 20: ...ler tighten the blade lock nut for you before using the trimmer If the blade lock nut is tightened too much the output shaft can break If the blade lock nut is not tightened enough the blade could com...

Page 21: ...ced Changing the Debris Shield Refer to the applicable illustration for removing and installing the debris shields Tighten the spacer bolts washers to the specified torque TORQUE 30 in lb 3 4 N m DEBR...

Page 22: ...while the semi matic head has a spring loaded round button on the bottom of the head which automatically extends the line during use when bumped on the ground Do not use any kind of metal wire or wir...

Page 23: ...o 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 If you are not sure if the lines have snapped out of the notches gen...

Page 24: ...out of the carburetor back to the fuel tank and then drain this fuel from the tank Oil Change the engine oil see page 16 Add oil in the engine cylinder to prevent rust 1 Remove the spark plug page 17...

Page 25: ...__________________________________ Date of purchase _____________________________________ Possible Cause Correction Ignition switch is in the STOP position Turn the ignition switch ON Choke is not in...

Page 26: ...hat May Affect Emissions If you are aware of any of the following symptoms have your engine inspected and repaired by your servicing dealer Hard starting or stalling after starting Rough idle Misfirin...

Page 27: ...capacity 2 7 fl oz 80 cc 3 4 fl oz 100 cc Carburetor type Diaphragm type overflow return with fuel pump Air cleaner Single element semi dry Idle speed 3 100 200 rpm Noise 94 8 dBA 8000 rpm Model GX25...

Page 28: ...eteriorates with age so try to avoid storing it for long periods especially in summer heat Fuel stabilizer will extend the shelf life of gasoline but it will not reconstitute stale fuel When you finis...

Page 29: ...e 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 what...

Page 30: ...ed warranty Some states do not allow limitations on how long an implied warranty lasts and or do not allow the exclusion or limitation of incidental or consequential damages so the above exclusions an...

Page 31: ...coverage under the emission warranty solely for use of non Honda replacement parts or service performed at a location other than an authorized Honda dealership however use of a part that is not funct...

Page 32: ...32 NOTES...

Page 33: ...33 NOTES...

Page 34: ...34 NOTES...

Page 35: ...eleased to any other company or organization Failure to register your trimmer does not diminish your warranty rights Please complete and mail the postage paid card or register online at powerequipment...

Page 36: ...nd click Submit It s that simple Power Equipment Division American Honda Motor Co Inc 4900 Marconi Dr Alpharetta GA 30005 9956 NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES Product Registration...

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