
0
1
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)
0h
50h
00h
Shutdown/
rest
Corresponding
Page
Engine oil
Inspect/clean
10
Replace
*1
17
Tightening parts (bolt,
nut)
Inspect
19
Fuel tank
Clean/inspect
—
Drain fuel
*
19
Throttle trigger/
throttle lever
Check function
—
Stop control lever/
stop switch
Check function
1
Low-speed rotation
Inspect/adjust
14
Air cleaner
Clean
18
Ignition plug / plug cord
Inspect
18
Cooling air duct
Clean/inspect
19
Fuel pipe
Inspect
19
Replace
*
—
Fuel filter
Clean/replace
19
Clearance between
air intake valve and air
discharge valve
Adjust
*
—
Oil tube
Inspect
*
—
Engine overhaul
*
—
Carburetor
Drain fuel
*
19
*1 Perform initial replacement after 0h operation.
*2 For the 200 operating hour inspection, request Authorized Service Agent or a machine shop.
*3 After emptying the fuel tank, continue to run the engine and drain fuel in the carburetor.
Summary of Contents for EB7650TH
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