KEEWAY ARN125, Service And Maintenance Manual

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82
• •• •
FUEL SYSTEM
•
Cylinder head cover/Valve
ENGINE CANN’T START
–
Fault from engine cylinder head/valve may effect on the
capability of engine.
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Carburetor lacks oil
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If engine is bad at slow speed, inspect whether ventilated
hole of crankcase gives out smoke. If it does, inspect
whether piston ring is blocked
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There is no fuel for the tank
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Filter is blocked
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Oil tube is blocked
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Ventilated hole of fuel tank cap is blocked Cylinder pressure is too low and difficult to start or is not
well at slow speed
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Oiil level is incorrect VALVE
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floater valve is clipped
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Valve adjustment is not correct
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Engine fuel is too much
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Valve is ablated or distorted
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Air cleaner is blocked
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Valve timing is not correct
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Oil leaks out of carburetor
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Valve spring is ruptured
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Fuel loses its efficience or is polluted
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Valve spring is loosened
Mix gas is too thin Cylinder cap
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Float lever is too low
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Air leaks out of cylinder cap gasket or the
gasket is damaged
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Oil leaks out of inlet valve
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Cylinder cap is bended or ruptured
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Oil tube is blocked
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Cyliner or piston is wrong
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Inlet oil tube of carburetor is blocked/bended Pressure is too high or engine is too hot or clashes
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Throttle valve is wrong
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There is carbon deposit on cylinder head or piston
head.
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Fuel jet is blocked Cylinder head gives out smoke
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Carburetor is not adjusted well
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Valve lever or valve pipe is abraded
Mix gas is too thick
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Valve lever oil seal is damaged
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Choke is in open position
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Cyliner, piston or piston ring is wrong
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Float lever is too high Cylinder head sounds abnormal noise
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Emulsification organ is blocked
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Valve is not adjusted correctly
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Air cleaner filter core is blocked
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Valve is clipped or valve spring is ruptured
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Gas leaks out of carburetor
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Camshaft is abraded or damaged
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Carburetor is not adjusted correctly
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Tiiming chain is too loose or abraded
Engine crushes out, difficult to starte and bad idle speed
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Cam chain gears and sprocket are abraded
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Oil tube throttles -Timing chain tensioner is abraded or damaged
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Ignition is wrong
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Rocker arm or rocker shaft is abraded
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Mix gas is too thin/thick
（
adjust mix ratio screw
） –
Cylinder or piston is wrong
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Fuel loses its efficience or is polluted Idle speed is not normal
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Air leaks out of inlet valve
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Cylinder pressure is too low
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Idle speed is too slow
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There is leakage on inlet valve
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Float lever is incorrect
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Fuel supplement system is blocked
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Ventilated hole of fuel tank is blocked
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Carburetor is wrong
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Oil pipe is blocked
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Air cleaner is blocked