Honda HHT25S User Manual download pdf (Page 26)

Low Power or Engine Speed Won’t Increase

Blade or Cutting Line Head Won’t Stop Turning When the

Throttle is at the Slow Position

Blade or Cutting Line Head Won’t Turn

Excessive Vibration

TECHNICAL INFORMATION

This section contains important information about serial number

locations, high altitude operation, and emission 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 28).

Engine serial number: _____________________________

Frame serial number: ______________________________

Date of purchase: _________________________________

Carburetor Modifications for High Altitude Operation

At high altitude, the standard carburetor air-fuel mixture will be too

rich. Performance will decrease, and fuel consumption will increase. A

very rich mixture will also foul the spark plug and cause hard starting.

Operation at an altitude that differs from that at which this engine was

certified, for extended periods of time, may increase emissions.

High altitude performance can be improved by specific modifications

to the carburetor. If you always operate your trimmer at altitudes

above 5,000 feet (1,500 meters), have your servicing dealer perform

this carburetor modification. This engine, when operated at high

altitude with the carburetor modifications for high altitude use, will

meet each emission standard throughout its useful life.

Even with carburetor modification, engine horsepower will decrease

about 3.5% for each 1,000-foot (300-meter) increase in altitude. The

effect of altitude on horsepower will be greater than this if no

carburetor modification is made.

NOTICE

When the carburetor has been modified for high altitude operation,

the air-fuel mixture will be too lean for low altitude use. Operation at

altitudes below 5,000 feet (1,500 meters) with a modified carburetor

may cause the engine to overheat and result in serious engine

damage. For use at low altitudes, have your servicing dealer return

the carburetor to original factory specifications.

Possible Cause Correction

Air filter is dirty or clogged. Clean or replace the air filter.

Fuel filter is dirty or clogged. Replace the fuel filter.

Throttle cable is out of

adjustment, broken, or bent.

Adjust the cable or replace it if

necessary.

Spark arrester screen

clogged.

Clean the screen.

Grass is wrapped around the

output shaft and/or cutting

attachment.

Move the ignition switch to the

STOP (O) position and disconnect

the spark plug cap from the spark

plug. Remove grass from the

output shaft and cutting attachment

area.

Possible Cause Correction

Fault in the throttle control or

cable; throttle cable out of

adjustment or bent.

Check the throttle control parts;

adjust or replace the cable if

necessary.

Idle speed is too fast. Adjust the idle speed.

Broken or worn clutch

springs, or faulty clutch

system.

Replace the clutch springs or

replace or repair other clutch

system parts.

Possible Cause Correction

Worn or broken clutch,

broken drive cable, worn or

broken gear case parts.

Replace or repair faulty

components as needed.

Possible Cause Correction

Loose cutting-line head or

blade nut.

Tighten the cutting-line head or

blade nut securely.

Cutting-line is not wound

properly or has unequal line

lengths.

Rewind the cutting-line and cut to

equal lengths.

Damaged blade. Replace the blade.

ENGINE

SERIAL

NUMBER

FRAME SERIAL NUMBER

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 32

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Honda HHT25S User Manual Page 26

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