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Fuel is not
reaching carburetor
Fuel is not reaching
cylinder
Engine does not start (or, is difficult to start)
Engine cranks
There is fuel in the tank
Fuel is reaching carburetor
Fuel is reaching cylinder
There is spark at high
tension cord end
There is spark at plug
Starting procedures
correct
No spark at high tension
cord end.
No spark at plug
Fuel does not
keep running
Acceleration
and low speed
function
defective
Carburetor
overflow
Engine does
not crank
Fuel strainer clogged ................................... Clean.
Fuel pipe clogged .........................................Clean.
Suction insufficient ....................................... Make sufficient.
Strainer clogged ...........................................Clean.
Carburetor out of order .................................Disassemble and check.
C.D.I. module defective ................................ Remove and replace.
Ignition coil defective .....................................Remove and replace.
Wire connection defective ............................. Reconnect.
High-tension cord connection defective .........Repair as necessary.
Switch is grounded .......................................Switch on.
Insulator cracked ..........................................Replace plug.
Spark gap incorrect ......................................Adjust.
Covered with carbon .....................................Clean or replace.
Fouled with fuel ............................................Clean or replace.
Starting procedures incorrect .......................Start correctly.
Low and high speed needle ...........................Readjust.
setting too lean
Table 1
Metering lever spring too strong.................... Readjust.
Fuel pump diaphragm defective ....................Replace.
Fuel passage clogged with dust ....................Disassemble and clean.
Fuel leaking from fixing surfaces .................. Retighten all screws.
of carburetor
Air valve, fuel tank cap does not
work normally ...............................................Replace or Clean.
Fuel pump does not operate .......................... Check impulse drilling.
Fuel inlet needle valve clogged with dust ....... Clean.
Metering lever spring not placed
in dent of lever ..............................................Correct.
Muffler sticky with fuel.................................. Fuel mixture is too rich
Start the engine several times
with choke rod fully open and
run at fast idle until engine
does not smoke.
Bearing damaged ......................................... Disassemble and replace.
Piston and/or cylinder seized ........................Disassemble and replace.
Crankshaft worn ..........................................Disassemble and replace.
Crankshaft contacting crankcase .................. Disassemble and replace.
TROUBLESHOOTING
Poor performance of the engine and/or cutting mechanism can normally be prevented by carefully following these
instructions.
Poor performance can easily be corrected even by a beginner.
When the engine does not function properly check the following three (3) points first.
• Is the engine compression adequate?
• Is fuel system in good condition and is enough fuel being supplied?
• Is electrical system in good condition and is spark plug operating normally?
When there is serious trouble with the unit, do not try to repair it yourself but have your distributor or dealer do it for you.
For detailed TROUBLESHOOTING refer to tables 1 and 2. Locate the problem on the following charts and repair as
necessary.