Makita PM7650H Owner's And Safety Manual page 27

Fault location
Fault
Engine not starting or with
difficulty
Warm start problems
Engine starts but dies
Insufficient performance
Operating time
Item
Engine oil Inspect/clean
Replace
Tightening parts Inspect
(bolt, nut)
Fuel tank Clean/inspect
Drain fuel
Throttle lever Check
function
Stop switch Check
function
Low-speed rotation Inspect/adjust
Air cleaner Clean
Ignition plug Inspect
Cooling air duct Clean/inspect
Fuel pipe Inspect
Replace
Fuel filter Clean/replace
Clearance between Adjust
air intake valve and
air discharge valve
Oil tube Inspect
Engine overhaul
Carburetor Drain fuel
*1 Perform initial replacement after 20h operation.
*2 For the 200 operating hour inspection, request Authorized Service Center or a machine shop.
*3 After emptying the fuel tank, continue to run the engine and drain fuel in the carburetor.
System
Ignition system Ignition spark O.K.
No ignition spark
Fuel supply Fuel tank filled
Compression No compression when pulled
over
Mechanical fault Starter not engaging
Tank filled ignition spark
existing
Fuel supply Tank filled
Several systems may Engine idling poor
simultaneously be
affected
Before After
operation lubrication
Observation
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
Daily 30h
(10h)
27
Cause
50h 200h Shutdown/
rest
*1
*2
*2
*2
*2
Corres-
ponding P
12
23
25
–
*3
26
–
14
16
24
24
25
25
–
25
–
–
–
*3
26