Yamaha YXR660FAS Service Manual download pdf (Page 88)

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CHK

ADJ

CHECKING THE IGNITION TIMING/

MEASURING THE COMPRESSION PRESSURE

6. Check:

• ignition timing

▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼

a. Warm up the engine and keep it at the

specified speed.

b. Remove the timing plug 1.

c. Visually check the stationary pointer 2 to

verify it is within the required firing range 3

indicated on the flywheel.

Incorrect firing range → Check the pulser

coil assembly.

d. Install the timing plug.

▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲

7. Install:

• engine cooling fan

8. Install:

• air shroud 1

9. Detach:

• timing light

• tachometer

10.Lower the cargo bed.

11.Install:

• console

• passenger seat

• driver seat

Refer to “SEATS, ENCLOSURE, HOOD

AND CARGO BED” in chapter 8.

MEASURING THE COMPRESSION

PRESSURE

NOTE:

Insufficient compression pressure will result in

a loss of performance.

1. Check:

• valve clearance

Out of specification → Adjust.

Refer to “ADJUSTING THE VALVE

CLEARANCE”.

2. Start the engine and let it warm up for sev-

eral minutes.

3. Stop the engine.

4. Lift the cargo bed up.

Engine speed

1,450

~

1,550 r/min

1

2

3

T

R

.

.

7 Nm (0.7 m

·

kg, 5.1 ft

·

lb)

T

R

.

.

10 Nm (1.0 m

·

kg, 7.2 ft

·

lb)

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