Power Unit; Power Unit (Check And Adjustment); Checking The Compression Pressure; Checking The Oil Pressure - Yamaha F200B Service Manual

POWR
Power unit (check and
adjustment)

Checking the compression pressure

1. Start the engine, warm it up for 5–10 min-
utes, and then stop it.
2. Remove the clip from the engine shut-off
switch.
3. Remove the fuel rail covers (PORT and
STBD), and then disconnect fuel injector
couplers.
4. Remove the engine ECM cover, ignition
coils, and spark plugs. NOTICE: Before
removing the spark plugs, remove any
dirt or dust in the spark plug wells that
could fall into the cylinders.
5. Install the special service tools 1 and 2
into the spark plug hole.
1
2
Compression gauge 1: 90890-03160
Compression gauge extension 2:
90890-06563
6. Turn the engine start switch to ON.
7. Fully open the throttle.
8. Crank the engine until the reading on the
compression gauge stabilizes, and then
measure the compression pressure.
Minimum compression pressure (reference
data): 630.0 kPa (6.30 kgf/cm
9. Turn the engine start switch to OFF.
10. Remove the special tools.
7-1

Power unit

2
, 91.4 psi)
11. Install the spark plugs, and then tighten
them to the specified torque.
Spark plug: 25 N·m (2.5 kgf·m, 18.4 ft·lb)
12. Install the ignition coils, and then tighten
the ignition coil bolts to the specified
torque.
Ignition coil bolt: 7 N·m (0.7 kgf·m, 5.2 ft·lb)
13. Connect the fuel injector couplers, and
then install the fuel rail covers (PORT
and STBD) and engine ECM cover.

Checking the oil pressure

1. Connect the YDIS to display "Oil pres-
sure."
2. Start the engine and warm it up until the
engine idle speed stabilizes at 600–700
r/min.
3. Measure the oil pressure.
Oil pressure (reference data):
507.3 kPa (5.073 kgf/cm
at 60 °C (140 °F) with SL 10W-30
engine oil and at 650 r/min
700.6 kPa (7.006 kgf/cm
at 62 °C (144 °F) with SL 10W-30
engine oil and at 3000 r/min

Checking the pulser coil air gap

Do not turn the flywheel magnet counter-
clockwise. Otherwise, the water pump
impeller could be damaged.
1. Remove the flywheel magnet cover, and
then remove the wiring harness guide
bolts and lift up the wiring harness guide.
TIP:
To completely remove the wiring harness
guide when checking the air gap, see
"Reducing the fuel pressure" (6-7) and
"Removing the wiring harness" (7-20).
2
, 73.6 psi)
2
, 101.6 psi)