Honda HHT35S Owner's Manual page 18

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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 later.
Air Filter Check
Squeeze the air cleaner latch tabs, and remove the air cleaner cover.
Check the filter to be sure it is clean and in good condition.
If the filter is dirty, clean it as described under Air Filter Cleaning.
Replace the filter if it is damaged. Reinstall the filter and air cleaner
cover.
NOTICE
Operating the engine without an air filter, or with a damaged air filter,
will allow dirt to enter the engine, causing rapid engine wear. This type
of damage is not covered by the Distributor's Limited Warranty.
Air Filter Cleaning
A dirty air filter will restrict air flow to the carburetor, reducing engine
performance. If you operate the engine in very dusty areas, clean the
air filter more often than specified in the MAINTENANCE
SCHEDULE.
1. Clean the air filter in warm soapy water, rinse, and allow to dry
thoroughly. Or clean in nonflammable solvent and allow to dry.
2. Dip the air filter in clean engine oil, then squeeze out all excess oil.
The engine will smoke when started if too much oil is left in the
filter.
3. Wipe dirt from the air cleaner base and cover using a moist rag. Be
careful to prevent dirt from entering the carburetor.
FILTER
AIR CLEANER
COVER
LATCH
TAB
18
RETAINING TABS
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: 1/16 ~ 1/8 in (1.0 ~ 3.0 mm)
If adjustment is needed, use the following cable adjustment
procedure.
CABLE END
FREE PLAY
1/16 ~ 1/8 in
(1.0 – 3.0 mm)
Throttle Cable Adjustment
1. Loosen the lock nut with a 10 mm wrench, and turn the adjusting
nut as required.
• Turn the adjusting nut left for more free play.
• Turn the adjusting nut right for less free play.
2. Tighten the lock nut and recheck cable free play.
Spark Plug Service
Recommended spark plug: CMR5HSB (NGK)
NOTICE
Incorrect spark plugs can cause engine damage.
1. Remove the 5 x 12 mm hex bolt and top cover.
5/32 in (4 mm)
HEX WRENCH
(commercially available)
5 x 12 mm
HEX BOLT
SPARK PLUG
SPARK PLUG
CAP
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.
LOCK NUT
ADJUSTING
NUT
TOP
COVER

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