KTM 250 SX-F 2005, Repair Manual

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9-3
ERROR
Engine won't rev up
Engine does not have
enough power
Engine stops or backfires in
the carburetor
Engine gets too hot
High oil consumption
CAUSE
Carburetor overflows because the
float needle is soiled or worn
Loose carburetor jets
Electronic ignition advance is
defective
Fuel supply is sometimes
interrupted or the carburetor soiled
Leak in the float
Air filter is heavily soiled
Exhaust system is not tight,
deformed or there is not enough
glass-fiber yarn in the silencer
Valve clearance is too small
Electronic ignition advance is
defective
Shortage of fuel
Engine draws in unmetered air
Not enough cooling liquid in the
cooling system
Insufficient air stream
Cooling system not bleeded
Radiator fins are heavily soiled
Foam has formed in the cooling
system
Bent radiator hose
Bent engine ventilation hose
Engine oil level is too high
Engine oil is too thin (viscosity)
REMEDY
Disassemble the carburetor and check for wear
Tighten the jets
Have the ignition system checked
Clean and check the fuel system and carburetor
Replace the float
Clean or replace the air filter
Check the exhaust system for damage, replace the glass fiber
yarn in the main silencer
Adjust the valve clearance
Check the ignition system
Clean and check the fuel system and carburetor
Check the rubber sleeve and carburetor for a tight fit
Add cooling liquid, check the cooling system for leaks
Continue driving speedily
Bleed the cooling system
Clean the radiator fins with a water jet
Replace the cooling liquid, use brand-name antifreeze
Shorten or replace the radiator hose
Install the ventilation hose without kinks or replace
Check the engine oil level and correct if necessary
Use thicker engine oil; see Owner's Manual