Pilot Screw Adjustment; Idle Drop Procedure; Tentative Idle Speed; Final Opening - Honda 2003 NPS50 Ruckus Service Manual

FUEL SYSTEM
PILOT SCREW ADJ USTMENT
('03 - '05 model)
•

IDLE DROP PROCEDURE

Remove the plug maintenance lid (page 4-6).
•
The pilot screw is factory pre-set and no adjust­
ment is necessary unless the pilot screw is
replaced.
Use a tachometer with graduations of 50 rpm or
smaller that will accurately indicate a 50 rpm
change.
1. Turn the pilot screw clockwise until it seats
Damage to the pilot
lightly, and then back it out to the specification
screw seat will
given.
occur if the pilot
screw is tightened
TOOL:
against the seat.
Pilot screw wrench
INITIAL OPENING: 2-1/4 turns out
2. Warm the engine up to operating temperature.
Stop and go riding for 1 0 minutes is sufficient.
3. Stop the engine and connect a tachometer
according to its manufacturer'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 60 kPa (450
mmHg).
6. Start the engine and adjust the idle speed with
the throttle stop screw.

TENTATIVE IDLE SPEED: 1,600

7. Turn the pilot screw in or out slowly to obtain the
highest engine speed.
B. 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 1 00 rpm.
1 0.Turn the pilot screw counterclockwise the final
opening from the position obtained in step 9.
FINAL OPENING: 3/4 turns out
1 1 . 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: 2,000 ± 100 rpm
Disconnect the tachometer and install the plug.
maintenance lid (page 4-8).
6- 1 8
071<MA-MS60101 or
07MMA-MT3010B or
07MMA-MT3010A
(U.S.A. only)
±
100 rpm