Honda TRX400EX FOURTRAX 1999, Service Manual

Page: 66 / 263

FUEL SYSTEM
SPECIFICATIONS
ITEM SPECIFICATIONS
Carburetor identification number
Main jet
Slow jet
#38
Jet needle clip position
Pilot screw opening
Float level
speed
Throttle lever free
TOOL
Carburetor float level gauge 07401 - 0010000
Pilot screw wrench 07908-4220201
3rd groove from top
See page 5-13
18.5 mm (0.73 in)
1,400
3
-
8
-
5/16 in)
TROUBLESHOOTING
Engine cranks but won't start
No
fuel in tank
No fuel to carburetor
-Clogged fuel stainer
-Clogged fuel line
-Clogged fuel tank breather tube
Too much fuel getting to the engine
-Clogged air cleaner
-Flooded carburetor
Intake air leak
fuel
Improper choke operation
Improper throttle operation
No
spark at plug (faulty ignition system
Lean mixture
Clogged fuel jets
Faulty float valve
Float level too low
Restricted fuel line
Clogged carburetor air vent tube
Restricted fuel tank breather tube
Intake air leak
Faulty throttle valve
Rich mixture
Starting enrichment valve close
Clogged air jets
Faulty float valve
Float level too high
Dirty air cleaner
Worn jet needle or needle jet
section 16)
Engine stalls, hard t o start, rough idling
Restricted fuel line
Contaminated/ deteriorated fuel
Misadjusted idle speed
Misadjusted pilot screw
Restricted fuel tank breather tube
Clogged air cleaner
Clogged slow circuit
Starting enrichment valve close
(ON)
Faulty ignition system (section 16)
Afterburn when engine braking is used
Lean mixture in slow circuit
Faulty air cut-off valve
Faulty ignition system (section
Fuel mixture too
Intake air leak
Backfiring or misfiring during acceleration
Lean mixture
Faulty ignition system (section 16)
Poor performance and poor fuel economy
Clogged fuel system
Faulty ignition system (section 16)
5-2