High Altitude Adjustment (After '05 Model) - Honda Metropolitan CHF50 Service Manual

FUEL SYSTEM
7. Lightly open the throttle 2 or 3 times, then adjust
the idle speed with the throttle stop screw.
8. Turn the pilot screw in until the engine speed
drops by 50 rpm.
9. Turn the pilot screw counterclockwise to final
opening from the position obtained in step 8.
FINAL OPENING: 1/4 turns out
10.Readjust the idle speed with the throttle stop
screw.
IDLE SPEED: 2,000 ± 100 rpm
11 .Disconnect the tachometer and install the rubber
plug.
HIGH ALTITUDE ADJUSTMENT
(After '05 model)
This adjustment
must be made at
high altitude to
ensure proper high
altitude operation.
When the vehicle is to be operated continuously
above 2,000 m (6,500 feet), the carburetor must be
readjusted as described below to improve
driveability and decrease exhaust emissions.
Replace the standard main jet with the high altitude
type.
HIGH ALTITUDE MAIN JET: #70
Warm up the engine to operating temperature. Ride
the scooter for approximately 10 minutes.
TOOL:
Pilot screw wrench 07KMA-MS60101 or
07MMA-MT3010B or
07MMA-MT3010A
(U.S.A. only)
HIGH ALTITUDE PILOT SCREW OPENING:
1/2 turn in from the factory preset position
Open the seat and remove the rubber plug
Adjust the idle speed with the throttle stop screw.
IDLE SPEED: 2,000 ± 100 rpm
THROTTLE STOP SCREW
MAIN JET
j PILOT SCREW WRENCH
^THROTTLE STOP SCREW
5-20