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KTM 50 SX Junior Manual

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TECHNICAL DATA – ENGINE »
ENGLISH
33
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
Loose carburetor jets
Clean carburetor, if necessary replace float needle and
adjust level
Tighten jets
High rpm misfiring Incorrect heat range spark plug or
low quality spark plug
Loose, corroded or non conductive ignition socket
connector
Refer to technical data section
Check and seal with silicon
Engine spluters into the car-
buretor
Lack of fuel
Spark plug with incorrect heat value (Ignition by
incandescence)
Engine takes air out of control
Clean fuel pipes, examine tank aeration and clean
Fit correct spark plug
Check intake flange and carburettor if firmly setted
Engine overheating Insufficient liquid in cooling system
Radiator fins clogged
Frothing in cooling system
The motorcycle is being driven too slowly, the clutch
keeps slipping, causing heat to develop
Pinched or kinked water hoses
Incorrect ignition timing because of loose stator
screws
Incorrect compression ratio
Top up coolant and bleed cooling system check cool-
ing system for leaks
Clean radiatar fins with water jet
Renew coolant using branded anti-freeze/anti-corro-
sive (Motorex Anti-Freeze)
Drive the motorcycle faster or reduce the preload on
the clutch springs
Replace with correct routed hoses
Readjust to correct ignition timing specifications,
secure screws with Loctite 243
Measure and adjust compression ratio
Emission of white smoke
(steam)
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
… 34 …


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