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Improper fuel is used Use fuel with correct mixing
ratio. Never use gasoline of
poor quality.
Spark plug defective (burnt) Replace.
As cooling fins clogged, air Clean fins.
does not pass well
Excessive deposits in Disassemble and remove
combustion chamber carbon.
Plug damaged or fouled Replace or clean.
Combustion poor due to Check wiring.
defective wiring
Carburetor overflow Refer to Table 1.
Air filter clogged Clean as necessary.
Compression insufficient Disassemble, check and
(piston ring stuck or worn replace if necessary.
out)
Cylinder chromium plating Replace cylinder.
peeled or worn out
Exhaust port clogged with Clean as necessary.
carbon
Throttle is not fully open Readjust.
Pump case/blade worn out Replace.
(Low pressure)
Chemical liquid line Replace.
defective
(Mechanical seal or packing
etc.)
Cracked spraying hose is Replace.
used
Nozzle orifice is too large Replace.
(Too much chemical is
released)
Chemical line is completely Clean.
clogged with dirt
Chemical tank is empty Refill.
Pump is damaged Replace.
Firing function defective
Engine overheated
Output (engine speed) insufficient
Table 2
Engine keeps running,
Carburetor defective
Other troubles
Spray is not a fine mist
No spray
Output (engine speed) sufficient
WARNING DANGER
FUEL VAPORS ARE EXTREMELY FLAMMABLE AND MAY CAUSE FIRE AND/OR EXPLOSION. NEVER
TEST FOR IGNITION SPARK BY GROUNDING SPARK PLUG NEAR CYLINDER PLUG HOLE,
OTHERWISE SERIOUS PERSONAL INJURY MAY RESULT.