KTM 125 Repair Manual

Repair manual KTM 125 / 200
Art No 3.206.005 -E
8-2C
TROUBLE SHOOTING
If you let the specified maintenance work on your motorcycle be carried out, disturbances can hardly be expected. Should an error
occur nevertheless, we advise you to use the trouble shooting chart in order to find the cause of error.
CAUSE
Operating error
Fuel supply interrupted
Electrode distance too great
Plug fouled by oil, wet or bridged
Ignition wire or spark plug connector
damaged
Kill button wire or
short-circuit switch faulty
Loose ignition cable connectors
Spark too weak
Water in the carburetor and jets
blocked
Idle adjusting screw out of adjustment
Ignition system damaged
Wear
Charred glass fiber yarn in silencer
Air filter obstructed
Control flap does not work
Fuel supply partly interrupted or
blocked
Loss of compression through loose
spark plug
Exhaust system damaged
Engine has not enough preignition
REMEDY
Open fuel tap, switch o ignition, replenish fuel, do not use choke
Close fuel tap, loosen fuel hose at carburettor, lead into a
basin and open fuel tap,
– if fuel leaks out, clean carburettor
– if no fuel leaks out, check tank ventilation, i.e. clean fuel tap
Reduce electrode distance (0.60 mm)
Clean spark plug or renew
Dismount spark plug, connect ignition cable, hold to ground
(blank place on engine) and actuate kickstarter, a strong
spark must be produced at the spark plug
–
If no spark is produced, loosen spark plug cap from ignition
cable, hold about 5 mm from ground and actuate kickstarter
– If a spark now occurs, replace spark plug cap
– If no spark is produced, control ignition system
Disconnect yellow-black coloured cable from CDI and check
ignition spark. If the spark is O.K. repair defective part of
cable, ignition lock or ignition switch
Inspect cable connectors
Examine ignition system
Dismantle and clean carburetor
Readjust idle running or replace idle adjusting screw
Examine ignition system
Overhaul engine
Renew filling
Clean or renew airfilter
Check control flap, joint rod and centrifugal timer
Blow through fuel pipe and clean carburetor
Tighten spark plug
Check exhaust system for damage
Check and adjust ignition
TROUBLE
Engine fails to start
Engine without idle running
Engine has not enough
power

KTM 125 Specifications

General

Bore x Stroke	54 mm x 54.5 mm
Starter	Kickstarter
Transmission	6-speed
Engine Type	Single-cylinder, 2-stroke
Displacement	124.8 cm³
Cooling System	Liquid cooled
Fuel System	Carburetor
Lubrication	Premix (oil-fuel mixture)