COMPRESSION
If the there is lack of power, excessive oil
consumption or poor fuel economy, measure the compression
pressure. |
1. |
Warm up and stop engine.
Allow the engine to warm up to normal
operating temperature. |
2. |
Remove ignition coils. (Refer to Ignition in
EE group) |
3. |
Remove spark plugs.
Using a 16mm plug wrench, remove the 4 spark
plugs. |
4. |
Check cylinder compression
pressure.
(1) |
Insert a compression gauge into the
spark plug hole.

|
(2) |
Fully open the
throttle. |
(3) |
While cranking the engine, measure the
compression pressure.
Always use a fully charged battery
to obtain engine speed of 250 rpm or
more. | |
(4) |
Repeat steps (1) through (3) for each
cylinder.
This measurement must be done in
as short a time as
possible. |
Compression pressure :
1,420kPa (14.5kgf/cm²,
206psi)
Minimum pressure :
1,270kPa (13kgf/cm²,
184psi)
Difference between each cylinder
:
100kPa (1.0kgf/cm², 15psi) or
less
| |
(5) |
If the cylinder compression in 1 or more
cylinders is low, pour a small amount of engine oil into the
cylinder through the spark plug hole and repeat steps (1)
through (3) for cylinders with low compression.
A. |
If adding oil helps the
compression, it is likely that the piston rings and/or
cylinder bore are worn or
damaged. |
B. |
If pressure stays low, a valve may
be sticking or seating is improper, or there may be
leakage past the
gasket. | | |
5. |
Reinstall spark
plugs. |
6. |
Install ignition coils. (Refer to Ignition in
EE group) |
Timing belt tension adjustment
1. |
Remove the engine cover(A).

|
2. |
Remove RH front
wheel. |
3. |
Remove the 4bolts(B) and timing belt upper
cover(A).

|
4. |
Turn the crankshaft pulley, and align its
groove with timing mark "T" of the timing belt cover.

|
5. |
Temperarily loosen tensioner pulley(A) by
center bolt.

|
6. |
Timing belt tension adjusting.
(1) |
Rotate crankshaft in regular direction
(clock wise view from front) through angle equivalent to two
teeth (18°) of camshaft sprocket(A).

|
(2) |
Using a hex wrench, turn the adjust
counterclockwise to make the indicator of the arm(A) located
at the center of the base notch.

|
(3) |
Tightening tensioner bolt.
Tightening torque
Tensioner bolt
22.6 ~ 28.4Nm (2.3 ~ 2.9kgf.cm,
16.6 ~ 21.0lbf.ft)
| |
(4) |
Recheck the belt tension, When the
tension side of timing belt is pushed horizontally with a
moderate force [approx. 2kg (20N, 5lb)], the timing belt cog
end sags in approx. 4 ~ 6mm (0.16 ~ 0.24in.)

| |
7. |
Turn the crankshaft two turns in the operating
direction (clockwise) and realign crankshaft sprocket and camshaft
sprocket timing mark. |
8. |
Install the timing belt upper cover(A) with
4bolts(B).
Tightening
torque
7.8 ~ 9.8Nm (0.8 ~ 1.0kgf.m, 5.8 ~
7.2lb-ft)
|

|
9. |
Install RH front
wheel. |
10. |
Install engine cover(A).

|
VALVE CLEARANCE INSPECTION AND
ADJUSTMENT
MLA (MECHANICAL LASH
ADJUSTER)
Inspect and adjust the valve clearance when
the engine is cold (Engine coolant temperature : 20°C) and cylinder
head is installed on the cylinder
block. |
1. |
Remove the engine
cover. |
2. |
Remove the upper timing belt
cover.
(1) |
Loosen the upper timing cover bolts and
then remove the
cover. | |
3. |
Remove the cylinder head cover.
(1) |
Disconnect the spark plug cables and do
not pull on the spark plug by force.
Pulling on or bending the cables
may damage the connductor
inside. | |
(2) |
Disconnect the P.C.V hose(A) and the
breather hose(B) from the cylinder head cover.

|
(3) |
Disconnect the accelerater cable(A) from
the cylinder head cover.

|
(4) |
Loosen the cylinder head cover bolts(B)
and then remove the cover(A) and gasket.

| |
4. |
Set No.1 cylinder to
TDC/compression.
(1) |
Turn the crankshaft pulley and align its
groove with the timing mark "T" of the lower timing belt
cover.

|
(2) |
Check that the hole of the camshaft
timing pulley(A) is aligned with the timing mark of the
bearing cap.
If not, turn the crankshaft one
revolution (360°)

| |
5. |
Inspect the valve clearance.
(1) |
Check only the valve indicated as shown.
[No. 1 cylinder : TDC/Compression] measure the valve
clearance.

A. |
Using a thickness gauge, measure
the clearance between the tappet shim and the base
circle of camshaft. |
B. |
Record the out-of-specification
valve clearance measurements. They will be used later to
determine the required replaement adjusing
shim.
Valve clearance
SpecificationEngine coolant
temperature : 20°C [68°F]Intake : 0.20mm
(0.0079in.)Exhaust : 0.28mm
(0.0110in.)
LimitIntake : 0.12 ~ 0.28mm
(0.0047 ~ 0.0110in.)Exhaust : 0.20 ~ 0.38mm
(0.0079 ~ 0.0150in.)
| | |
(2) |
Turn the crankshaft pulley one
revolution (360°) and align the groove with timing mark "T" of
the lower timing belt cover. |
(3) |
Check only valves indicated as shown.
[NO. 4 cylinder : TDC/compression]. Measure the valve
clearance. (See procedure in step (6))

| |
6. |
Adjust the intake and exhaust valve
clearance.
(1) |
Turn the crankshaft so that the cam lobe
of the camshaft on the adjusting valve is
upward. |
(2) |
Using the SST(09220-2D000), press down
the valve lifter and place the stopper between the camshaft
and valve lifter and remove the special tool.

|
(3) |
Remove the adjusting shim with a small
screw driver(A) and magnet(B).

|
(4) |
Measure the thickness of the removed
shim using a micrometer.

|
(5) |
Calculate the thickness of a new shim so
that the valve clearance comes within the specificified
value.
Valve
clearance (Engine coolant temperature :
20°C)
T : Thickness of removed
shim
A : Measured valve
clearance
N : Thickness of new
shim
Intake : N = T + [A -
0.20mm(0.0079in.)]
Exhaust : N = T + [A-0.28mm
(0.0110in.)]
| |
(6) |
Select a new shim with a thickness as
close as possible to the caculated value. [Refer to the
Adjusting shim selection chart]
Shims are available in 20size
increments of 0.04mm (0.0016in.) from 2.00mm (0.079in.)
to 2.76mm
(0.1087in.) | |
(7) |
Place a new adjusting shim on the valve
lifter. |
(8) |
Using the SST(09220-2D000), press down
the valve lifter and remove the
stopper. |
(9) |
Recheck the valve
clearance.
Valve
clearance (Engine coolant temperature :
20°C)
[Specification]
Intake : 0.20mm
(0.0079in.)
Exhaust : 0.28mm
(0.0110in.)
[Limit] (After adjusting valve
clearance)
Intake : 0.17 ~ 0.23mm (0.0067 ~
0.0091in.)
Exhaust : 0.25 ~ 0.31mm (0.0098 ~
0.0122in.)
|


| |