MAINTENANCE AND ADJUSTMENT OF THE UTV
- 91-
MEASURING THE COMPRESSION
PRESSURE
NOTE:
Insufficient compression pressure will result
in a loss of performance.
1. Start the engine and let it warm up for several
minutes.
2. Stop the engine and remove the spark plug.
3. Assemble the compression pressure meter
① and joint utensil ② on the hole of the
spark plug.
4. check
valve clearance
Out of specification
Adjust. Refer to
“ADJUSTING THE VALVE CLEARANCE”
standard value
standard compression pressure data
1200Kpa (12kg/ cm
2
)-1000r/min
5. read the highest data on the compression
pressure meter
·Above the maximum pressure:
Check the cylinder head, valve surfaces, and
piston crown for carbon deposits.
·Below the minimum pressure:
Check the accumulation carbon in the
firebox of the cylinder head and
accumulation carbon on the piston head.
·Refer to the table below.
Compression pressure(with oil introduced
into cylinder)
Reading Diagnosis
Higher than
without oil
Worn or damaged pistons
Same as
without oil
Defective ring(s), valves,
cylinder head gasket or
piston is possible.
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