Yamaha ttr230 Service Manual page 62

COMPRESSION PRESSURE MEASUREMENT
Compression pressure (at sea level)
Standard:
1,200 KPa (12 kg/cm², 171 psi)
Minimum:
960 KPa (9.6 kg/cm², 128 psi)
Maximum:
1,300 KPa (13 kg/cm², 185 psi)
If the pressure is below the minimum level:
1) Pour some drops of oil into the affected
cylinder.
2) Measure the compression again.
Compression pressure
(with oil poured into the cylinder)
Reading
Higher than without
oil
Same as without oil
Above the maximum
level
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8. Install:
Spark plug
Spark plug
17,5N.m (1.75Kg.m ; 12.5 ft.lb)
See Section "SPARK PLUG INSPECTION."
9. Connect:
Spark plug cap
3-16
INSP
ADJUS
Diagnostic
Worn or damaged
piston
Ring, valve, head or
piston gasket worn
or damaged
Inspect head and
valve surfaces or
carbon fouling on
the piston head