Makita PM7650H, Owner'S And Safety Manual

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Fault location
Fault System Observation Cause
Engine not starting or with
difficulty
Ignition system 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 supply Fuel tank filled Incorrect choke position, carburetor defective, fuel
supply line bent or blocked, fuel dirty.
Compression No compression when pulled
over
Cylinder bottom gasket defective, crankshaft seals
damaged, cylinder or piston rings defective or improper
sealing of spark plug
Mechanical fault Starter not engaging Broken starter spring, broken parts inside of the engine
Warm start problems Tank filled ignition spark
existing
Carburetor contaminated, have it cleaned
Engine starts but dies Fuel supply Tank filled Incorrect idling adjustment, carburetor contaminated
Fuel tank vent defective, fuel supply line interrupted,
cable or STOP-switch faulty
Insufficient performance Several systems may
simultaneously be
affected
Engine idling poor Air filter contaminated, carburetor contaminated, muffler
clogged, exhaust duct in the cylinder clogged
Operating time
Item
Before
operation
After
lubrication
Daily
(10h)
30h 50h 200h Shutdown/
rest
Corres-
ponding P
Engine oil Inspect/clean 12
Replace *1 23
Tightening parts
(bolt, nut)
Inspect
25
Fuel tank Clean/inspect
–
Drain fuel *3 26
Throttle lever Check
function
–
Stop switch Check
function
14
Low-speed rotation Inspect/adjust 16
Air cleaner Clean
24
Ignition plug Inspect 24
Cooling air duct Clean/inspect
25
Fuel pipe Inspect
25
Replace *2
–
Fuel filter Clean/replace
25
Clearance between
air intake valve and
air discharge valve
Adjust
*2 –
Oil tube Inspect *2 –
Engine overhaul *2 –
Carburetor Drain fuel *3
26
*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.