Checking The Exhaust Gas - Yamaha XG250 Service Manual

Thickness gauge
90890-03079
Narrow gauge set
YM-34483
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4. Adjust:
Valve clearance
●
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a. Loosen the locknut "1".
b. Insert a thickness gauge between the end of
the adjusting screw and the valve stem.
c. Turn the adjusting screw "2" until the speci-
fied valve clearance is obtained.
Tappet adjusting tool
90890-01311
Valve adjuster 3 mm & 4 mm
YM-08035-A
Hold the adjusting screw to prevent it from
●
moving and tighten the locknut to specifica-
tion.
Locknut
14 Nm (1.4 m•kg, 10 ft•lb)
d. Measure the valve clearance again.
e. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjust-
ment steps until the specified clearance is
obtained.
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5. Install:
O-rings
New
●
Cylinder head side cover 1
●
O-rings
New
●
Cylinder head side cover 2
●
2
1
3-4
Cylinder head side cover
18 Nm (1.8 m•kg, 13 ft•lb)
O-rings
New
●
Cylinder head side cover 3
●
Cylinder head side cover bolts
10 Nm (1.0 m•kg, 7.2 ft•lb)
Spark plug
●
Spark plug
18 Nm (1.8 m•kg, 13 ft•lb)
Spark plug caps
●
6. Install:
Fuel tank
●
Fuel tank side cover (left and right)
●
Seat/side cover (left and right)
●
Refer to "GENERAL CHASSIS" on page 4-1.
EAS20580

CHECKING THE EXHAUST GAS

(When the air induction system is not operat-
ing)
1. Stand the vehicle on a level surface.
NOTE:
Place the vehicle on a suitable stand.
●
Make sure the vehicle is upright.
●
Measure the exhaust gas at idle when the air
●
induction system is not operating.
2. Install:
Temperature probe tester "1"
●
(onto the engine oil drain bolt)
Digital tachometer
●
Exhaust attachment
●
(onto the exhaust pipe)
Pocket tester
90890-03132
Digital tachometer
90890-06760
ENGINE