Yamaha F115A Service Manual page 120

INSP
ADJ
3392
GENERAL
1
5. Measure:
• Compression pressure
Below minimum compression pres-
sure → Inspect valve clearance, valve
face, valve seat, piston rings, cylinder
sleeve, piston, cylinder head gasket
and cylinder head.
Compression pressure
Minimum
950 kPa (9.5 kg/cm
Measurement steps
(1) Remove the lock plate from the engine
stop lanyard switch on the remote con-
trol box.
(2) With the throttle wide open, crank the
engine setting the main switch in the
START position until the reading on
the compression gauge stabilizes.
6. Remove:
• Compression gauge
7. Install:
• Spark plug(-s)
OIL PRESSURE MEASUREMENT
1. Warm-up:
• Engine
2. Remove:
• Oil pressure switch
3. Install:
• Oil pressure gauge 1
(into the oil pressure switch hole)
NOTE:
Use a pressure gauge with the range of 0 to
2
10 kg/cm and an adopter with a PT 1/4
thread.
3-24
E
2
, 135 psi)
3