3. INSPECTION/ADJUSTMENT
3-10
MXU 300/250
CYLINDER COMPRESSION
Warm up the engine before compression
test.
Remove the spark plug.
Insert a compression gauge.
Open the throttle valve fully and push the
starter button to test the compression.
Cylinder compression:
MXU 250: 15 kg/cm² (1500 kPa, 213 psi)
MXU 300: 16 kg/cm² (1600 kPa, 227 psi)
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.
ENGINE OIL
OIL LEVEL
Place the machine on a level place.
Warm up the engine for several minutes and
stop it.
Check the oil level through the inspection
window.
The oil level should be between the
maximum (H) and minimum (L) marks. If
the level is low, add oil to raise it to the
proper level.
Run the engine for 2～3 minutes and
check the oil level after the engine is
stopped for 2～3 minutes.
＊
Compression Gauge
Inspection Window
Lower Level
Upper Level
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