Carburetor Adjustment; Idle Mixture And Idle Speed - Honda CRF450X 2005 Service Manual

FUEL SYSTEM
CARBURETOR ADJUSTMENT
6-6
IDLE MIXTURE AND IDLE SPEED
STANDARD SETIING:
flOAT LEVEL:
8.0 mm
10.31
in)
PILOT SCREW INITIAL OPENING:
'05 - '07: ' -1/4 turns out
After '07:
' -1/ 8tums
out
SlOWJET: ~5
MAIN JET:
'05 - '07: #142
After '07 : .145
JET NEEDLE:
·os,
'06: NCVU
'07: NHTU
After '07: NNEU
JET NEEDLE CLIP POSITION :
'05, '06: 2nd position from the top
After '06: Fixed position
1. When the engine is warm enough to run without
the choke, push the choke knob in to its off posi-
tion.
2. Turn the throttle stop screw to obtain the
smoothest idle:
• To decrease idle speed, turn the throttle slop
screw counterclockwise.
• To increase idle speed, turn the throttle stop
screw clockwise.
3. Adjust the pilot screw to obtain the best off-idle
performance.
• If the engine runs rich exiting a corn er, turn the
pilot screw clockwise to lean the mixtu re.
• If the engine runs lean exiting a corner, turn the
pilot screw counterclockwise to fichen the mix-
ture.