KYMCO Downtown 300i ABS User Manual

3. INSPECTION/ADJUSTMENT
3-7
Downtown 300i ABS
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
- 570 rpm
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

KYMCO Downtown 300i ABS Specifications

General

Brand	KYMCO
Model	Downtown 300i ABS
Category	Motorcycle
Language	English