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28

AVOIDING FUEL-RELATED PROBLEMS

When maintained properly, your Honda trimmer should provide years of trouble-free operation. This includes the fuel system. However, 
gasoline can quickly deteriorate, causing starting or running problems and, in some cases, damage to the fuel system. Most fuel-related 
problems can be avoided by following the precautions listed below. Fuel system damage and engine performance problems resulting from 
deteriorated fuel are not covered by the 

Distributor’s Limited Warranty

 (see 

page 30

).

Follow These Precautions to Prevent Most Fuel-Related Problems

During The Normal Trimming Season

Reason

Do not use gasoline containing more than 10% ethanol.

A high level of ethanol in gasoline attracts water and can corrode 
or damage the fuel system and cause performance problems.

Store gasoline in a clean, plastic, sealed container approved for 
fuel storage. 

Store your fuel supply container away from direct sunlight; if the 
container has a vent, keep it closed.

A clean plastic container will prevent rust and metallic 
contaminants from entering the fuel system.

Gasoline will deteriorate faster when exposed to air and sunlight.

Purchase only enough gasoline to last for 30 to 60 days.

If you purchase enough gasoline to last for more than 60 days, 
add a fuel stabilizer to your storage tank when you fill it.

Gasoline deteriorates 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 finish trimming, completely fill the trimmer’s fuel tank.

If the fuel tank is only partially filled, air in the tank will promote 
fuel deterioration.

3 to 4 Weeks Before Next Use

Reason

Completely fill the trimmer’s fuel tank.

If the fuel tank is only partially filled, air in the tank will promote 
fuel deterioration.

1 to 3 Months Before Next Use

Reason

If you did not add fuel stabilizer to your fuel storage tank when 
you filled it up, fill your trimmer’s fuel tank with fresh gasoline. 

If the fuel tank is only partially filled, air in the tank will promote 
fuel deterioration.

Add fuel stabilizer to the trimmer’s tank according to the stabilizer 
manufacturer’s instructions.

Fuel stabilizer will extend the life of gasoline, but it will not 
reconstitute stale gasoline.

Run the engine outdoors for 10 minutes.

To make sure treated gasoline has replaced untreated gasoline 
throughout the fuel system.

More Than 3 Months Before Next Use

Reason

Drain the fuel tank into an approved container and then run the 
engine until the engine stops. Do not allow gasoline to remain in 
your trimmer for more than 3 months of inactivity.

All fuel stabilizers have a shelf life. It is good practice to empty 
the fuel system for long term inactivity.

We recommend Pro Honda Fuel Stabilizer, that has improved formulation with added corrosion protection (

page 29

).

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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