Sym Quad Lander 300, Service Manual

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To this chapter contents
1. GENERAL INFORMATION
Troubles Diagnosis
A. Engine hard to start or can not be started
1-14
Check and adjustment Fault condition Probable causes
Loosen carburetor drain bolt to
check if there is gasoline inside
the carburetor
y
No fuel in fuel tank
y
Check if the pipes, fuel tank to carburetor
and intake vacuum, are clogged.
y
Float valve clogged
y
Lines in fuel tank evaporation system
clogged
y
Malfunction of fuel pump
Fuel supplied tom
carburetor sufficient No fuel is supplied to
carburetor
y
Loosen or damaged fuel pump vacuum
hose
Remove spark plug, install it
into spark plug cap, and perform
a spark test against engine
ground.
y
Fuel filter clogged
y
Malfunction of spark plug
y
Spark plug foul
y
Malfunction of CDI set
y
Malfunction of AC generator
y
Ignition coil is in open or short circuit
y
Ignition coil leads open or short circuit
y
Malfunction of main switch
Check if sparks Weak sparks, no spark at
all
Perform cylinder compression
pressure test.
Cylinder compression
pressure normal Low compression
pressure or no pressure
y
Piston ring seized
y
Malfunction of cylinder valves
y
Worn cylinder and piston ring
y
Cylinder gasket leak
y
Sand hole in compression parts
y
Malfunction of throttle valve operation
y
Air sucked into intake manifold
y
Incorrect ignition timing
Re-start by following the starting
procedures
No ignition There are some signs of
ignition; nut engine can
not be started
Remove the spark plug again
and check it.
y
Fuel level in carburetor too high
Remove carburetor after 30
minutes and connect a hose
onto fuel rich circuit. Then blow
the hose with air
Dry spark plug Wet spark plug
y
Malfunction of throttle valve operation
y
Throttle valve opening too wide
Blowing in normal Blowing clogged
y
Malfunction of automatic by- starter