Makita BHX2500 Instruction Manual page 17

Fault location
Fault
Engine not starting or with
difficulty
Warm start problems
Engine starts but dies
Insufficient performance
Operating time
Item
Engine oil
Tightening parts (bolt, nut)
Fuel tank
Throttle lever
Stop switch
Low-­speed rotation
Air cleaner
Ignition plug
Cooling air duct
Fuel pipe
Fuel filter
Clearance between air
intake valve and air dis-
charge valve
Oil tube
Engine overhaul
Carburetor
*1 Perform initial replacement after 20h operation.
*2 For the 200 operating hour inspection, request A uthorized Service A gent or a machine shop.
*3 After emptying the fuel tank, continue to run the engine and drain fuel in the carburetor.
System
Ignition system
Fuel supply
Compression
Mechanical fault
Fuel supply
Several systems may
simultaneously be
affected
Before
operation
Inspect/clean
Replace
Inspect
Clean/inspect
Drain fuel
Check function
Check function
Inspect/adjust
Clean
Inspect
Clean/inspect
Inspect
Replace
Clean/replace
Adjust
Inspect
Drain fuel
Observation Cause
Ignition spark O.K. Fault in fuel supply or compression system, mechanical
defect
No ignition spark STOP-­switch operated, wiring fault or short circuit, spark
plug or connector defective, ignition module faulty
Fuel tank filled Incorrect choke position, carburetor defective, fuel supply
line bent or blocked, fuel dirty.
No compression when Cylinder bottom gasket defective, crankshaft seals dam-
pulled over aged, cylinder or piston rings defective or improper sealing
of spark plug
Starter not engaging Broken starter spring, broken parts inside of the engine
Tank filled ignition spark Carburetor contaminated, have it cleaned
existing
Tank filled Incorrect idling adjustment, carburetor contaminated
Fuel tank vent defective, fuel supply line interrupted, cable
or STOP-­switch faulty
Engine idling poor Air filter contaminated, carburetor contaminated, muffler
clogged, exhaust duct in the cylinder clogged
After lubri- Daily
cation (10h)
17
30h 50h 200h
*1
*2
*2
*2
*2
Shut-
Correspond-
down/
ing P
rest
9
14
16
—
16
*3
—
11
12
15
15
16
16
—
16
—
—
—
16
*3