Yamaha XG250 Service Manual page 56

3. Install:
Hose clip "1"
●
(To air induction system hose; "2")
4. Start the engine and warm it up until the
specified oil temperature is reached.
Oil temperature
95.0–105.0 °C (203.00–221.00 °F)
5. Measure:
Engine idling speed
●
Out of specification → Adjust.
Refer to "ADJUSTING THE ENGINE IDLING
SPEED" on page 3-6.
Engine idling speed
1350–1550 r/min
6. Install:
CO/HC tester "1"
●
Sampling prove "2"
●
1
1
2
1
2
NOTE:
Since it is necessary to insert the sampling
●
probe 600 mm into the exhaust pipe, be sure
to use a heat-resistant rubber tube as shown
in the illustration.
Be sure to set the heat-resistant rubber tube
●
so that exhaust gas does not leak out.
600mm
7. Measure:
CO density
●
Out of specification → Adjust.
Within specification → Measure the exhaust
gas when the air induction system is operat-
ing.
Refer to "CHECKING THE EXHAUST GAS"
on page 3-6.
CO%
4.0–6.0 %
8. Adjust:
CO density
●
Turn the pilot screw to adjust the CO density
level to specification.
Pilot screw turns out
1-1/4
9. If the specified CO density cannot be ob-
tained by the pilot screw, check the following
items.
Air filter element
●
3-5
ENGINE
1