User's Manual

7-3E
TROUBLE CAUSE REMEDY
Engine stalling or running
with four stroke cycle
Carburetor overflows if level
adjust too high, float needle
seating is dirty or enlarged
Clean carburetor, if necessary replace float needle and
adjust level
Loose carburetor jets Tighten jets
High rpm misfiring Incorrect heat range spark plug
or low quality spark plug
Refer to technical data section
Loose, corroded or non conductive
ignition socket connector
Check and seal with silicon
Engine spluters into the
carburetor
Lack of fuel Clean fuel pipes, examine tank aeration and clean
Spark plug with incorrect heat value
(Ignition by incandescence)
Fit correct spark plug
Engine takes air out of control Check intake flange and carburettor if firmly setted
Engine overheating Insufficient liquid in cooling
system
(only LC-engine)
Top up coolant and bleed cooling system check cooling
system for leaks
Radiator fins clogged
(only LC-engine)
Clean radiatar fins with water jet
Frothing in cooling system
(only LC-engine)
Renew coolant using branded anti-freeze/anti-corrosive
(Motorex Anti-Freeze)
Pinched or kinked water hoses
(only LC-engine)
Replace with correct routed hoses
Incorrect ignition timing because
of loose stator bolts
Readjust to correct ignition timing specifications, secure
bolts with Loctite 243
Incorrect compression ratio Measure and adjust compression ratio
Emission of white smoke
(steam)
(only LC-engine)
Cylinder head or O-ring of
cylinder head gasket leaks
Check cylinder head, replace O-ring
Excessive oil escapes from
transmission breather tube
Excessive oil quantity in
transmission
Correct transmission oil level