PRE-OPERATION CHECK & FUEL
Be sure to read this section carefully before, attempting to operate
this unit.
1. Fill fuel tank with oil and gas mixture as indicated on red fuel tag
located on trimmer.
2. Alwaysmakesure
gasoline cap is tightened securely before
attempting to start engine.
READ CAREFULLY
LAWN-BOY 2 CYCLE OIL IS RECOMMENDED
FOR THIS LAWN-BOY TRIMMER
Lawn-Boy 2 cycle oil isformulated specifically for high performance,
two cycle engines. Special additives promote thorough mixing and
ready combustion. This give the engine the benefits of
clean,
fresh,
lubrication every revolution of the crankshaft.
Thoroughly mix contents of one 8-02. Lawn-Boy 2 cycle oil can with
two U.S. gallons of regular grade automotive gasoline. Do not mix directly in engine fuel tank. If you use two-cycle oil other than LawnBoy 2 cycle oil, a mixture of 6 oz. oil to 1 gal. gasoline is recommended.
Fig. 9-Fuel
trimmer.
decal located on
LAWN-BOY 2 CYCLE
OIL
MIXING RATIO
Lawn-Boy 2 cycleoilregular
gas
Do not use a synthetic baseoil for lubrication in Lawn-Boy Gasoline
Trimmers.
NOTE:
Remember to pay strict attention to the fuel mixing instructions. DO
NOT USE NO-LEAD FUEL OR GASOHOL. NOT FOLLOWING CORRECT MIXING PROCEDURES CAN CAUSE AN ENGINE
TO SEIZE
OR OTHER DAMAGE.
Gasoline is extremely flammable and highly explosive under certain
conditions. Always stop engine, and do not smokeorallow open
flame or spark whenrefueling.
18-2
SAFETY
RELATED
REVISED 1983
SERVICE BULLETIN REFERENCES
SERVICE BULLETIN REFERENCES
18-4
Low speed
mixture adj.
Metering lever
2 turns after
contact
with lever
One 1-1/2 turn from seat
(initially)
.060-.070below
carburetor body (metering
cover gasket surface
CARBURETOR
WALBRO
Idle speed
TILLOTSON
1 turn from Beat
Flush with carburetor
metering chamber floor
3 turns after contact
with lever
SERVICE BULLETIN REFERENCES
TROUBLE SHOOTING
K AND CAUSE
POSSIBLE
STARTER ROPE WILL NOT REWIND
Broken Starter Spring/Not enough Preload
Replace Starter Spring
Adjust tension per decal
STARTER DOES NOT ENGAGE FLYWHEEL
Broken Pawl Spring
Broken Pawls or Pins
Replace flywheel assembly
ENGINE DIFFICULTOR WILL NOT START
Fuel Tank empty
Solid State weak. CHECK: Remove Spark Plug, reattach
Plug Wire, hold Plug against engine and pull starter
rope (a strong white spark should jump across plug
points - weak Solid State produces a short red spark)
Solid State grounded. CHECK: Wire from Solid State to
“ON-OFF’’ Switch for bare spots.
Carburetor misadjusted
Engine flooded
Engine is severely vapor locked
Broken Reed Valve
Fill FuelTank
Replace C.D. Pack
Wrap Wire with electrical tape or replace
Re-adjustCarburetor
Follow Starting Procedure WITHOUT USING CHOKE
ALLOW TO COOL COMPLETELY
Readjust Carburetor
Replace
CARBURETOR FLOODS
Carburetor misadjusted
Damaged Carburetor Diaphragm
Leaking Gasket
Leaking Inlet Needle Seat
Readjust Carburetor
Rebuild Carburetor with new kit.
Rebuild Carburetor with new kit.
Rebuild Carburetor with new kit.
ENGINE WILL NOT IDLE
Carburetor misadjusted
Carburetor Diaphragm leaking
Carburetor Inlet Seat Gasket leaking
Crankshaft seals leaking
Cylinder scored or compression low
Reeds leaking or broken
Head bound with grass
Readjust Carburetor
Replace Diaphragm
Replace Gasket
Replace seals
Replace cylinder, piston and rings
Replace reed valve
Clean until free of grass
ENGINE BACKFIRESOR MISFIRES
Fuel Mix improper or contaminated
Spark Plug fouled
Solid State intermittently shorting. CHECK: loose or bare
wires or loose assemblies
Assembly Defective Reed
Drain tank and refill with freshly mixed fuel
Replace Spark Plug
Tighten assemblies, wrap wires
Replace
HEAD WILL NOT TURN WHEN THROTTLE LEVERIS SQUEEZED
Shaft broken
Head Bound with grass
Replace shaft
Clean until free
ENGINE WILL NOT ACCELERATE
Carburetor misadjusted
Dirty Air Filter
Spark Plug fouled or Solid State weak
Carbon build-up
Carburetor Diaphragm Cover loose or Diaphragm Gasket leaking
Broken Reed Valve
Readjust Carburetor
Clean Air Filter or replace
Replace Spark Plug and regap or replace C.D. pack if we
Clean Exhaust Port and Muffler
Tighten all screws
Replace
ENGINE LACKSPOWER OR DIES IN THE CUT
Dirty Air Filter
Carbon build-up
Low compression. CHECK: Compression pressure tests
below 90 PSI or lessened engine resistance to pulling
starter rope
ADVANCE
NOT
WILL
HEAD
LINE
Out of Line
Bump Knob Bound Up
Indexing Teeth Worn or Burred
Head Dirty
Line Welded
Not Enough Line Exposed
Clean Air Filter or replace
Clean Exhaust Port and Muffler, page 18-6
Overhaul and rebuild engine
Refill with Genuine Monoflail@Cutting Line
Replace
Replace
Clean
Disassemble remove welded section and rewind line
per instructions
Manually index until 4” or more of line shows
outside the head
18-5