Makita EBH340U Instruction Manual page 26

Fault location
Fault
Engine not starting
or with difficulty
Warm start
problems
Engine starts but
dies
Insufficient
performance
System
Ignition system
Fuel supply
Compression
Mechanical fault
Fuel supply
Several systems
may simultaneously
be affected
Observation
Ignition spark O.K.
No ignition spark
Fuel tank filled
No compression
when pulled over
Starter not engaging
Tank filled ignition
spark existing
Tank filled
Engine idling poor
26
Cause
Fault in fuel supply or compression
system, mechanical defect
STOP-switch operated, wiring fault
or short circuit, spark plug or
connector defective, ignition module
faulty
Incorrect choke position, carburetor
defective, fuel supply line bent or
blocked, fuel dirty.
Cylinder bottom gasket defective,
crankshaft seals damaged, cylinder
or piston rings defective or improper
sealing of spark plug
Broken starter spring, broken parts
inside of the engine
Carburetor contaminated, have it
cleaned
Incorrect idling adjustment,
carburetor contaminated
Fuel tank vent defective, fuel supply
line interrupted, cable or
STOP-switch faulty
Air filter contaminated, carburetor
contaminated, muffler clogged,
exhaust duct in the cylinder clogged