Honda 2004 CRF250X Service Manual page 126

FUELSVSTEM
5-30
Start the engine and let it idle for 3 minutes.
Turn the pilot screw in to the specification given.
HIGH ALTITUDE PILOT SCREW OPENING :
1/ 4 turn in from the factory preset position
TOOL:
Pilot screw wrench
'04 - '06: 07908·4730002
After '06: 07KMA· MN90101 and
07PMA· MZ20110 or
07KMA-MNS-Al00 (U.S.A only)
Adjust the idle speed with the throttle stop screw.
IDLE SPEED: 1,700 ± 100 rpm
I
NOTICE
I
When the carburetor has been modified for high
altitude operation, the air-fuel mixture will be too
lean for low altitude use. Operation at altitudes
below 5,000 feet (1,500
m)
with a modified carbure-
tor may cause the engine overheat. resulting in seri-
ous engine damage and increased exhaust
emissions.
For use at low altitudes, you should return the car·
~~~~~~~.~E
buretor to original factory specifications. •
Replace the main jet with the standard main jet.
Change the jet needle clip posit ion to the standard
position.
Screw out the pilot screw the specified number of
turns from the high altitude setti ng.
STANDARD MAIN JET:
' 1)4 -
'06: # 130
After '06:
#
132
STANDARD CLIP POSITION; 2nd position from
the top
LOW ALTITUDE PILOT SCREW OPENING :
1/4 tum
o ut from the high altitude setting
TOOL:
Pilot screw wrench
'04 - '06: 07908·4730002
After '06: 07KMA-MN90101 and
07PMA·M Z20110 or
07KMA· MN9·A100 (U.S.A only)
Warm up the engine and adjust the idle speed at
low altitude with the throttle stop screw.
IDLE SPEED: 1,700 ± 100 rpm