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Casing
Clamp
Screw
Now open needle valve 1-1/2 turns counterclockwise
and idle valve one turn. This initial adjustment will per-
mit the engine to be started and warmed up approx-
imately 5 minutes prior to final adjustment.
Final Adjustment-Place speed control lever in FAST
position. Turn needle valve in until engine slows (clock-
wise-lean mixture). Then turn it out past smooth
operating point (rich mixture). Now turn needle valve
to midpoint between rich and lean. Next, adjust idle
RPM. Rotate throttle counterclockwise and hold against
stop while adjusting idle speed adjusting screw to ob-
tain 1750 RPM. Holding throttle against idle stop, turn
idle valve in (lean) and out (rich). Set at midpoint be-
tween rich and lean. Recheck idle RPM. Release throt-
tle. If engine w111 not accelerate properly, the carburetor
should be re-adjusted, usually to a slightly richer
mixture.
"---T~
Fast Position
~' E
I '
\~' ,,\
F
Throttle Control Adjustment
Place speed control lever on equipment in FAST (high
speed) position. Loosen casing clamp screw "C," Move
casing "A" and wire until lever "E" touches link at "F,"
Tighten casing clamp screw "C." Move control to
STOP position. Lever must make good contact with
stop switch.
CONTROL ADJUSTMENTS
Proper choke and speed control operation is depend-
ent upon proper adjustment of controls on the powered
equipment.
To Check Operation
Move control lever to CHOKE position. The carburetor
choke should be closed.
To Adjust Choke:
Place control lever on equipment in CHOKE position.
Loosen casing clamp screw. Move casing and wire until
choke is completely closed. Tighten casing clampscrew.
SECTION 5
GENERAL INFORMATION
ENGINE DESIGN
This engine is single cylinder L-head. air-cooled type.
MODEL SERIES 281707
Bore 3-7/16"(87.31 mm)
Stroke 3-1/16" (77.78mm)
Displacement. 28.42 cu. in. (465.7 cc)
Horsepower Max. '."'..' ' .12 @ 3600 APM
Torque (Ft.-Lbs.) Max. 20.5 @ 2400 APM
The horsepower ratings listed are established in
accordance with the Society of Automotive Engineers
Test Code-J607. For practical operation, the
horsepower loading should not exceed 85% of these
ratings. Engine power will decrease 31/2% for each
1,000 feet above sea level and 1 % for each 100 above
600 F.
In some areas, local law requires the use of a resistor
spark plug so as to suppress ignition signals. If an
engine was originally equipped with a resistor spark
plug, be sure to use the same type of spark plug for
replacement.
Major engine repairs should not be attempted unless
you have the proper tools and a thorough knowledge
of internal combustion engines.
TUNE-UP SPECIFICATIONS
Spark Plug Type Champion Autolite
~. Short Plug CJ-8 235
Long Plug J-8 295
Resistor Short Plug RCJ-8 245
Resistor Long Plug RJ-8 306
Spark Plug Gap 030"
Intake Valve Clearance. 005"-.007"
Exhaust Valve Clearance. 009"-.011"
22