backplate snaps into place in the slot on the air filter cover
(Fig. 47).
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable. An idle adjustment
screw is between the air filter cover and the engine starter
housing (Fig. 48).
NOTE:
Careless adjustments can seriously damage your unit.
An authorized service dealer should make carburetor
adjustments.
Check Fuel
Old fuel is usually the reason for improper unit performance.
Drain and refill the tank with fresh fuel prior to making any
adjustments. Refer to
Oil and Fuel Information
.
Clean Air Filter
The condition of the air filter is important to the operation of
the unit. A dirty air filter will restrict air flow. This is often
mistaken for an out of adjustment carburetor. Check the
condition of the air filter before adjusting the idle speed screw.
Refer to
Air Filter Maintenance
.
Adjust Idle Speed Screw
If, after checking the fuel and cleaning the air filter, the engine
still will not idle, adjust the
idle speed screw as
follows:
1.
Start the engine and let
it run at a high idle for
a minute to warm up.
Refer to
Starting/Stopping
Instructions
.
2.
Release the throttle
trigger and let the
engine idle. If the
engine stops, insert a
small phillips in
between the Air Filter Cover and the Engine Cover (Fig.
48). Turn the idle speed screw in,
clockwise
, 1/8 of a turn
at a time (as needed) until the engine idles smoothly.
NOTE:
The cutting attachment should not rotate when the
engine idles.
3.
If the cutting attachment rotates when the engine idles,
turn the idle speed screw
counterclockwise
1/8 of a turn
at a time (as needed), to reduce idle speed.
Checking the fuel, cleaning the air filter, and adjusting the idle
speed should solve most engine problems. If not and all of the
following are true:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
ROCKER ARM CLEARANCE
This requires disassembly of the engine. If you feel unsure or
unqualified to perform this, take the unit to an authorized
15
MAINTENANCE AND REPAIR INSTRUCTIONS
filter thoroughly and allow it to dry.
4.
Apply enough clean SAE 30 motor oil to lightly coat the
filter (Fig. 44).
5.
Squeeze the filter to spread and remove excess oil (Fig.
45).
6.
Replace the filter (Fig. 46).
NOTE:
If the unit is operated without the air filter, you will
VOID
the warranty.
7.
Reinstall the air filter cover. Position the slots on the top of
the air filter cover onto the tabs at the top of the back
plate (Fig. 47).
8.
Swing the cover down until the tab on the air filter
Air Filter Cover
Air Filter
Tab
Locking Tab
Tabs
Back Plate
Air Filter
Idle Adjustment Screw
Fig. 43
Fig. 44
Fig. 45
Fig. 46
Fig. 48
Fig. 47
Summary of Contents for TB525ET
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