KTM 250 SX-F 2005 Repair Manual page 114

9-3
TROUBLE
Engine does not rev up
Engine will not reach full power Fuel supply partially interrupted or
Engine stops or splutters in
carburetor
Engine gets too hot
High oil consumption
The battery is discharged
CAUSE
Carburetor fuel level too high because float
needle valve is dirty or worn out
Loose carburetor jets
Electronic ignition timing faulty
carburetor dirty
Float leaks
Air filter very dirty
Exhaust system is not tight, deformed, or
the silencer does not contain enough
glassfiber yarn
Valve gap too small
Electronic ignition timing faulty
Insuffient fuel
Engine takes air out of control
Insufficient cooling liquid
Not enough air stream
Cooling system has not been bled
Radiators very dirty
Foam formation in cooling system
Bent cooling hose
Hose of engine ventilation is bent
Engine oil level too high
Motor oil too thin (viscosity)
The battery isn't charged by the generator
because
REMEDY
Dismount carburetor and check if worn out
Tighten jets
Have ignition system checked
Clean and check fuel system as well as carburetor
Replace the float
Clean or replace air filter
Check if exhaust is damaged, replace glasfiber yarn in
exhaust silencer
Adjust valve gap
Have ignition system checked
Clean and check fuel system and carburettor
Check rubber sleeve and carburetor for tight fit
Refill cooling liquid (see maintenace work), check cooling
system for leaks
Drive on briskly
Bleed cooling system
Clean radiators with water jet
Replace cooling liquid, use antifreeze liquid with brand name
Shorten or replace cooling hose
Dislocate i.e. replace non-buckling vetilation hose
Check engine oil level and, if necessary, correct it
Use thicker engine oil; see chapter "Engine oil"
Remove seat and fuel tank and check voltage regulator
connections; voltage regulator and generator should be
checked by a KTM dealer.