KYMCO Downtown 200i, Service Manual, Page: 38 / 230

3. INSPECTION/ADJUSTMENT
3-7
DOWNTOWN 200i
VALVE CLEARANCE
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
EX: 0.10 mm
Loosen the lock nut and adjust by turning the
adjusting nut
Valve Adjuster E012
Feeler Gauge
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: 16±2 kg/cm
2
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
.
•
Inspect and adjust valve clearance while
the engine is cold (below 35
℃
).
＊
•
Check the valve clearance again after the
lock nut is tightened.
＊
Bolts
Top Dead Center Mark
Special
Cylinder Head Cove
r