Idle Drop Procedure - Honda 2004 CRF250X Service Manual

FUEL SYSTEM
Damage to the pilot
screw seat will
occur
If
the
pilot
screw
IS
tightened
agamst the sear.
IDLE DROP PROCEDURE
(,04 - '06 California type, After '06)
1. Turn the pilot screw clockwise until it seats
lightly, and then back it out to the specification
given.
TOOL:
Pilot screw wrench
'04 - '06: 07908·4730002
After '06: 01KMA·MN90101 and
07PMA·MZ20110
or
07KMA·MN9-Al00 (U.S.A only)
INITIAL OPENING:
'04 - '06: 2 turns out
After '06: 2·1/4 turns out
2. Warm the engine up to operating temperature.
Stop and go riding for 10 minutes is sufficient.
3. Stop the engine and connect a tachometer
according to its manufactu rer's instruction.
4. Disconnect the PAIR control valve vacuum hose
and plug it to keep air from entering, then con-
nect the vacuum pump to the PAIR control valve
vacuum hose joint.
5. Apply the specified vacuum to the PAIR control
valve vacuum hose more than 56 kPa (420
mmHg).
VACUU HOSE
6. Start the engine and adjust the idle speed with
~=================~
5-28
the throttle stop screw.
IDLE SPEED: 1,700
±
100 rpm
7. Turn the pilot screw in or out slowly to obtain the
highest engine speed.
8. lightly open the throttle 2 or 3 times, then adjust
the idle speed with the throttle stop screw.
9. Turn the pilot screw in until the engine speed
drops by 50 rpm.
10.Turn the pilot screw counterclockwise to the final
opening from the position obtained in step 9.
FINAL OPENING : 1/2 tums out
11.Remove the plug from the vacuum hose, then
disconnect the vacuum pump and connect the
vacuum hose to the PAIR control valve.
12.Readjust the idle speed with the throttle stop
screw.
IDLE SPEED: 1,700
±
100 rpm
l3.Disconnect the tachometer.
VACUUM
PUMP
PAIR CONTROL VALVE
AIR SUPPLY
HOSE
AIR SUCTION