KTM 85/105 SX Owner's Manual page 33

TROUBLE SHOOTING
TROUBLE
Engine has not enough power
Engine revs not up and running
in four stroke cycle
High rpm misfiring
Engine spluters into the carburetor Lack of fuel
Engine overheating
32
Emission of white smoke (steam) Cylinder head or O-ring of cylin-
Excessive oil escapes from trans-
mission breather tube
Water in transmission oil
»
CAUSE
Reed paddles tensionless or
damaged, surface of reed valve
housing damaged
Wear
Carburetor overflows if level
adjust too high, float needle seat-
ing is dirty or enlarged
Loose carburetor jets
Incorrect heat range spark plug
or low quality spark plug
Loose, corroded or non conduc-
tive ignition socket connector
Spark plug with incorrect heat
value (Ignition by incandescence)
Engine takes air out of control
Insufficient liquid in cooling
system
Radiator fins clogged
Frothing in cooling system
Pinched or kinked water hoses
Incorrect ignition timing because
of loose stator screws
Incorrect compression ratio
der head gasket leaks
Excessive oil quantity in trans-
mission
Shaft seal ring of the water pump
defect
REMEDY
Replace reed paddles or reed valve housing
Overhaul engine
Clean carburetor, if necessary replace float needle and adjust level
Tighten jets
Refer to technical data section
Check and seal with silicon
Clean fuel pipes, examine tank aeration and clean
Fit correct spark plug
Check intake flange and carburettor if firmly setted
Top up coolant and bleed cooling system check cooling system for
leaks
Clean radiatar fins with water jet
Renew coolant using branded anti-freeze/anti-corrosive (Motorex
Anti-Freeze)
Replace with correct routed hoses
Readjust to correct ignition timing specifications, secure screws with
Loctite 243
Measure and adjust compression ratio
Check cylinder head, replace O-ring
Correct transmission oil level
Replace shaft seal ring of the water pump.