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10-3.
INSUFFICIENT
OUTPUT
2.
Ignition
system
malfunction
3.
Fuel system
malfunction
I
4.
Low
intake
air volume
Possible
causes
1
)
Loosen spark plug
2)
Cylinder head gasket leakage
3)
Piston ring(s) seizure or wear
4)
Piston or cylinder wear
5)
Incorrect valve and seat contact
6)
Valve stem seizure
7)
Improper valve clearance
1)
Spark plug faulty
2)
Ignition
coii faulty
3)
Improper air gap between ignition coil and flywheel
4)
Magneto demagnetization
1)
Carburetor clogged
2)
Improper fuel pump operation
3)
Fuel strainer or fuel hose clogged
~~~~ ~~~ ~~ ~~
4)
Air mixing into fuel lines
5)
Improper gasoline
or
water infiltration
1)
Air cleaner clogged
2)
Throttle valve faulty
Remedy
Retighten or replace gasket
Retighten
or
replace gasket
Replace
Repair
or
replace
Repair or replace
Repair or replace
Adjust
Replace
Replace
Adjust
Replace
Disassembly and clean
Disassembly and clean
Clean or replace
Check and adjust connecting
portion
Replace
Clean or replace
Repair
or
replace
10-4.
OVERHEAT
I
I
I
I
I
Phenomenon
Possible
causes
I
Remedy
1)
Cooling air
flow
obstructed at inlet or cylinder baffle
portion
Clean
Overheating
2)
Improper engine oil
I
Replace
3)
Lean aidfuel mixture
Change
to
rated load
5)
Over-load
Check, clean or replace
4)
Excessive back pressure of exhaust system
Check and adjust carburetor
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