KTM 85SX - Manual (Page 33)

ENGLISH
32
TROUBLE SHOOTING
»
TROUBLE CAUSE REMEDY
Engine has not enough power Reed paddles tensionless or
damaged, surface of reed valve
housing damaged
Wear
Replace reed paddles or reed valve housing
Overhaul engine
Engine revs not up and running
in four stroke cycle
Carburetor overflows if level
adjust too high, float needle seat-
ing 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 conduc-
tive ignition socket connector
Refer to technical data section
Check and seal with silicon
Engine spluters into the carburetor 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
Pinched or kinked water hoses
Incorrect ignition timing because
of loose stator screws
Incorrect compression ratio
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
Emission of white smoke (steam) Cylinder head or O-ring of cylin-
der head gasket leaks
Check cylinder head, replace O-ring
Excessive oil escapes from trans-
mission breather tube
Excessive oil quantity in trans-
mission
Correct transmission oil level
Water in transmission oil Shaft seal ring of the water pump
defect
Replace shaft seal ring of the water pump.