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10-7.
HIGH
FUEL
CONSUMPTION
Phenomenon
I
Possible
causes
~
Remedy
I
~
1)
Over-size main jet
I
Replace
1.
Fuel system
chamber
2)
Needle valve faulty and/or high fuel level in float
Adjust or replace
I
3)
Chock
valve does not open fully. Repair or replace
2.
Engine core
1)
Low
compression Check or repair
Check and adjust load and/or
engine speed
10-8.
DETONATION
I
Phenomenon
1.
Ignition
system
malfunction
2.
Fuel system
malfunction
3.
Cylinder
head
4.
Valve system
Possible
causes
1)
Poor connection
of
ignition system wirings
2)
Improper or damaged spark plug
1)
Lean or rich aidfuel mixture
2)
Carburetor damaged
3)
Fuel lines clogged or damaged
4)
Air mixing from connecting portion of air intake
system
1)
Catbon deposit
in
combustion chamber
2)
Cylinder head gasket faulty (blow-by)
1)
Improper valve clearance
2)
Valve heat deterioration
3)
Valve spring deterioration
4)
Improper valve timing
Remedy
Check and connect properly
Clean or replace
Clean, adjust or replace
Disassembly and clean
Clean or replace
Connect properly
or
replace
gasket
Remove and clean
Replace
Adjust
Replace
Replace
Adjust
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