Honda TRX450R Service Manual page 164

FUEL SYSTEM (After '05)
Screw the pilot screw in the specified number of
turns from the factory preset position using the spe-
cial tool.
HIGH ALTITUDE PILOT SCREW OPENING:
1/4 turn in from the factory preset position
TOOL:
Pilot screw wrench
07KMA-MN90101
Start the engine and warm it up.
Adjust the idle speed at high altitude with the throt-
tle stop screw to ensure proper high altitude opera-
tion.
IDLE SPEED: 1,700 ± 100 rpm
NOTICE
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-
buretor to original factory specifications.
Replace the main jet and starter jet with the stan-
dard jets.
Screw the pilot screw out the specified number of
turns from the high altitude setting.
STANDARD MAIN JET: #120
STANDARD STARTER JET: #75
LOW ALTITUDE PILOT SCREW OPENING:
1/4 turn out from the high altitude setting
I?
PILOT SCREW
•• THROTTLE STOP SCREW
TOOL:
Pilot screw wrench 07KMA-MN90101
Warm up the engine and adjust the idle speed at
low altitude with the throttle stop screw.
IDLE SPEED: 1,700 ± 100 rpm
8-26