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SERVICE
AIR FILTER
NOTE
Clean daily.
The low (LO) speed adjustment screw controls
the volume of fuel/oil mixture at low engine
speed. It also controls the supplementary fuel
required to obtain smooth progression from
idling to high speed.
1. Close choke, remove wing nut, air cleaner
cover and air filter.
2. Brush dust off filter and wash in suitable
solvent.
3. Dry filter before reinstalling.
ADJUSTING CARBURETOR
The high (H) speed adjustment screw controls
the volume of fuel/oil mixture at full throttle.
Initial Adjustment
NOTE
The needle screws have a sharp point. To
avoid carburetor damage, do not use
excessive force when seating needle in body.
1. Turn HI and LO adjustment screws clockwise
until seated lightly in carburetor body.
2. Turn LO adjustment screw counterclockwise
1
%
turn.
3. Start engine and allow it to run at high idle
until warm (approx. 2-3 minutes).
NOTE
Idle speed screw may have to be readjusted
to keep engine from stalling.
General
NOTE
Do not adjust carburetor unless necessary. If
you have trouble with carburetor, see your
dealer. Always adjust carburetor with pipes
assembled to the blower.
The idle speed adjustment screw controls the
throttle opening at idle position.
Low Speed Adjustment
1. Slowly turn the LO adjustment screw
clockwise and note the position when the
engine speed drops.
2. Turn the LO adjustment screw counter¬
clockwise and note position when engine
speed drops.
3. Set the screw midway between these points.
4. Turn idle speed clockwise until a speed of
2500-3400 RPM is achieved and engine idles
without stalling.
High Speed Adjustment
NOTE
Engine must be at normal operating
temperature.
1. Turn the HI adjustment screw counter¬
clockwise t
%
turn.
2. While running tne engine at full throttle, turn
the HI adjustment screw slowly clockwise
until the engine runs smoothly.
8
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