Valve Clearance; Cylinder Compression - KYMCO X-Town 250 ABS Service Manual

3. INSPECTION/ADJUSTMENT

VALVE CLEARANCE

＊
 Inspect and adjust valve clearance
while the engine is cold (below 35℃).
Remove the seat assy and luggage box.
Remove the four bolts and then cylinder
head cover.
Turn the A.C. generator flywheel to the top
dead center (TDC) on the compression
stroke so that the "T" mark on the flywheel
aligns with the index mark on the left
crankcase cover.
Inspect and adjust valve clearance.
Valve Clearance: IN: 0.10 mm
Loosen the lock nut and adjust by turning the
adjusting nut
Special
Valve Adjuster
Feeler Gauge
＊
 Check the valve clearance again after
the lock nut is tightened.

CYLINDER COMPRESSION

Warm up the engine before compression
test.
Remove the center cover and luggage box.
Remove the spark plug.
Insert a compression gauge.
Open the throttle fully and push the starter
button to test the compression.
Max. Compression: 15 kg/cm
If the compression is low, check for the
following:
‧Leaky valves
‧Valve clearance too small
‧Leaking cylinder head gasket
‧Worn piston rings
‧Worn piston/cylinder
If the compression is high, it indicates that
carbon deposits have accumulated on the
combustion chamber and the piston head.
3-7
EX: 0.10 mm
E012
2
Cylinder Head Cover
Index Mark
"T" Mark
Valve Wrench
X-Town250/300 ABS
Bolts
Punch Mark