20
Maintenance (continued)
WARNING!
Sharpen only the cutting
teeth of a blade. DO NOT alter the
contour of the blade in any way.
WARNING!
Wear protective gloves when handling or performing maintenance on
the blade.
When the cutting edges of the blade become dull, they can be resharpened with a
few strokes of a file. In order to keep the blade in balance, all cutting edges must
be sharpened equally.
Blade Sharpening
Round
File
Multiple-tooth Circular Blade
Use a round file to maintain a radius of 0.04 to 1 to 1.5 mm (0.06”) at the base of
each tooth. Cutting edges must be offset equally on each side.
Maintain a radius of 0.04 to 1 to 1.5 mm
(0.06”) at the base of each tooth. Cutting
edges must be offset equally on each side
Multiple-tooth Circular Blade
Carburetor Adjustment
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel break-in before carburetor adjustments can be
made. During the break-in period your engine performance will increase and exhaust emissions will stabilize. Idle speed can
be adjusted as required.
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory starting, emission, and durability performance up to
1,100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation and emission compliance above
1,100 feet ASL the carburetor may need to be adjusted by an authorized Shindaiwa service dealer.
IMPORTANT!
If the engine is adjusted for operation
above
1,100 feet ASL, the carburetor must be re-adjusted when operating the
engine
below
1,100 feet ASL, otherwise severe
engine damage may result.
NOTE:
Every unit is run at the factory and the carburetor is set in compliance with emission regulations. Carburetor adjustments,
other than idle speed, must be performed by an authorized Shindaiwa dealer.
Adjusting Engine Idle
The engine must return to idle speed
whenever the throttle lever is released.
Idle speed is adjustable, and must be set
low enough to permit the engine clutch
to disengage the cutting attachment.
WARNING!
The cutting attachment
must NEVER rotate at engine idle!
If the idle speed cannot be adjusted
by the procedure described here,
return the trimmer to your Shin-
daiwa dealer for inspection.
Idle Speed Adjustment
1. Place the unit on the ground, then
start the engine, and then allow it to
idle 2-3 minutes until warm.
2. If the attachment rotates when the
engine is at idle, reduce the idle
speed by turning the idle adjustment
screw counter-clockwise.
3. If a tachometer is available, adjust
idle. Check Specifications page for
correct idle speed
NOTE:
Carburetor fuel mixture adjustments
are preset at factory and cannot be
serviced in the field.
Idle adjustment
screw
