KYMCO MX 125 - Ignition Timing;Cylinder Compression; Carburetor Idle Speed

3. INSPECTION/ADJUSTMENT
3-6
MX’er SYSTEM
Remove the cylinder head cover.
Turn the flywheel counterclockwise so that
the “T” mark on the flywheel aligns with
the index mark on the crankcase to bring the
round hole on the camshaft gear facing up
to the top dead center on the compression
stroke.
Inspect and adjust the valve clearance.
Valve Clearance: IN: 0.06mm
EX: 0.06mm
Loosen the lock nut and adjust by turning
the adjusting nut
Tappet adjuster E012
CARBURETOR IDLE SPEED
Warm up the engine before this operation.
Start the engine and connect a tachometer.
Turn the throttle stop screw to obtain the
specified idle speed.
Idle Speed: 1700±100rpm
When the engine misses or run erratic,
adjust the air screw.
Bolts
Punch Marks
Valve Wrench
IGNITION TIMING
• Check the valve clearance again after
the lock nut is tightened.

• The engine must be warm for accurate
idle speed inspection and adjustment.

The CDI unit is not adjustable. If the
ignition timing is incorrect, check the
ignition system.

Throttle Stop Screw
Cylinder Head Cove
r
Special
Throttle Stop Screw