um DSR EX 125 User Manual

ADJUSTING THE COMPRESSION PRESSURE
N.B.:
INSUFFICIENT COMPRESSION PRESSURE LEADS TO A LOSS
OF POWER.
Check:
- Valve clearance.
Outside that specified => Adjust .
See “ VALVE CLEARANCE ADJUSTMENT ” section.
Start the engine and leave to warm up for a few minutes.
Stop the engine.
Extract:
- Spark plug.
ATTENTION
BEFORE REMOVING THE SPARK PLUG, BLOW AROUND IT
WITH COMPRESSED AIR TO REMOVE ANY DIRT, THEREBY
PREVENTING THIS FROM FALLING INTO THE ENGINE.
Fit:
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Measurement:
- Compression pressure.
If it exceeds the permitted maximum pressure => Inspect
the cyulinder head, valve surfaces and piston head for
carbonisation.
If below the minimum pressure=> Inject a few drops of
oil into the cylinder and measure again.
Follow the table below:
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READING
DIAGNOSTIC
More than without oil
The same as without oil
Piston worn or damaged
Possibility of defect in the rings, valves or seals of
the cylinder head or piston => Repair.
24
REGULAR INSPECTION
AND ADJUSTMENTS
WORKSHOP MANUAL

um DSR EX 125 Specifications

General

Brand	um
Model	DSR EX 125
Category	Engine
Language	English