Yamaha YP250R 2005 Service Manual page 75

CHECKING THE EXHAUST GAS AT IDLE/CHECKING
AND ADJUSTING THE EXHAUST GAS AT IDLE
1
6. Measure:
• engine idling speed
Out of specification → Adjust.
Refer to
IDLING SPEED".
Engine idling speed
1,550 ~ 1,650 r/min
7. Connect:
• CO tester 1
(to the exhaust attachment)
8. Measure:
• CO density
Out of specification → Check air induction
system.
Refer to "AIR INDUCTION SYSTEM" in
chapter 7.
CO density (when air induction
system is operating)
4.0%
(Reference value)
CHECKING AND ADJUSTING THE
EXHAUST GAS AT IDLE
Check the exhaust gas at idle when the air
induction system is not operating.
1. Stand the vehicle on a level surface.
NOTE:
• Place the vehicle on a suitable stand.
• Make sure that the vehicle is upright.
• The air filter element should be cleaned, and
the engine should have adequate compres-
sion.
2. Remove:
• footrest board
Refer to "COVERS AND PANELS".
3. Remove:
• exhaust pipe bolt 1
3 - 13
CHK
ADJ
"ADJUSTING THE ENGINE