Honda 400ex Carburetor Float Adjustment

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  • Float level could be set wrong too. As far as I know the float level on the stock 400EX carb cannot be adjusted. There is no metal bar connecting the two floats together that can be bent for adjustment. The float is all plastic and would break if you tried to bend it to adjust it.
  • Oct 25, 2017 Adjusting the carburetor float on an ATV is a necessary step in the process of rebuilding or rejetting the carburetor. Each time the carburetor is removed from the ATV, the float level should be checked for adjustment, and reset if necessary. There are two methods, and a few simple steps to adjusting the floats on an ATV carburetor.
08-27-2004, 12:55 AM
ATM Contributor!
Last Online: 03-10-2020 04:53 PM
Posts: 8,393
Re: 400ex carb problem
A little trick I learned awhile back.....
Turn the gas off, and remove the float bowl (while carb is still attached to the motor.)
After all the gas is drained out of the carb, turn the gas back on (with float bowl still removed).
Gas will start pouring out of the bottom of the carb now.
Push up on the floats till the gas stops flowing.
If the gas stops flowing when the floats are level, then the floats are set to the correct height, and there is no leakage from the float valve.
If the floats shut off the fuel BEFORE they are level, you may be starving the motor of fuel at high speed.
If you have to push the floats higher than level, then you may be flooding the motor.
If the floats don't shut off the flow of gas regardless of how high you raise them, then you've got some sand or dirt keeping the float valve open, OR your float valve is worn.
Oh yeah, welcome to the site!
General Specs
ManufacturerHonda
Year2003
ModelTRX400EX
Model NameSportrax 400EX
Model CodeTE23
Product CodeHN1
Frame VIN LocationStamped on front of frame
Engine Serial LocationStamped on bottom of left crankcase cover
Frame Starting Number478TE230*34300001
478TE232*34300001 (Canada)
478TE23U*34300001 (Australia)
Engine Starting NumberTE23E8000001
Owner Manual31HN1640
Service Manual61HN105
Chassis
Length1835 mm (72.2 in)
Width1150 mm (45.3 in)
Height1110 mm (43.7 in)
Seat Height810 mm (31.9 in)
Wheelbase1230 mm (48.4 in)
Ground Clearance110 mm (4.3 in)
Curb Weight178 kg (392.5 lb)
Dry Weight170 kg (374.9 lb)
Caster Angle6.5°
Trail28 mm (1.1 in)
Tire & Rim
Front Tire Size (HxW-R)22x7-10
Rear Tire Size (HxW-R)20x10-9
Engine
Engine Type4 Stroke Air Cooled
Cylinder ArrangementSingle cylinder
Displacement397 cc (24.2 ci)
Bore85 mm (3.3 in)
Stroke70 mm (2.8 in)
Compression Ratio9.1:1
Cylinder Compression686-883 kPa (99-128 psi)
Starter TypeElectric
Oil Capacity - Total2.2 L (2.3 US qt; 1.9 Imp qt)
Oil Capacity - Oil Change1.8 L (1.9 US qt; 1.6 Imp qt)
Engine Dry Weight41.5 kg (91.5 lb)
Drive Train & Transmission
Clutch TypeManual
Transmission Type5 Speed
Primary Reduction2.826
First Gear2.916
Second Gear1.937
Third Gear1.473
Fourth Gear1.181
Fifth Gear1.000
Final Reduction2.533
Gear Shift Pattern1 - N - 2 - 3 - 4 - 5
DrivelineChain
Drive Chain (Size/Links)520/94
Carburetor
BrandKeihin
Identification MarkQB10A
TypePiston valve
Throttle Bore38 mm (1.5 in)
Main Jet#148
Pilot Jet/Slow Jet#38
Jet Needle Clip Position3rd Groove
Pilot Screw Adjustment2 1/4 Turns out
Float Level18.5 mm (0.7 in)
Engine Idle1400 RPM
Air Filter TypeOiled urethane foam
Fuel Tank Capacity10 L (2.6 US gal; 2.2 Imp gal)
Fuel Tank Reserve1.6 L (0.4 US gal; 0.4 Imp gal)
Ignition
Ignition TypeAC-CDI
CDI Identification MarkCI718 (HN1)
Spark PlugDPR8Z (NGK)
X24GPR-U (Denso)
Spark Plug Gap Max0.6-0.7 mm (0.024-0.028 in)
Pulse Generator Peak Voltage0.7 V minimum
Exciter Coil Peak Voltage100 V minimum
Lighting Coil0.1-1 Ω
Primary Coil Peak Voltage100 V minimum
Initial Ignition Timing8.0° BTDC
Electrical
Voltage12 V
Power TypeDC
Alternator Max Output147 W
Alternator Max Output RPM5000 RPM
Regulator VoltageLess than 15.5 V
Brakes
Front Brake TypeDual hydraulic disc
Rear Brake TypeHydraulic disc
Suspension
Front SuspensionDouble wishbone
Rear SuspensionSwingarm
Front Wheel Travel209 mm (8.2 in)
Rear Wheel Travel230 mm (9.1 in)

Operating the Honda engine with the wrong adjustment settings can also cause damage to the engine. Honda 400ex Carburetor Float Adjustment Instructions I just bought a 2007 400ex used and when I got the the previous owner had twisted the idle screw pretty bad and the quad was stuck idling kinda high.The quad had run wonderfully before I. Rumble Check out my Sponsor Village TacticalAbsolute Computershttp://www.absolutecompute.

Honda 400ex Carburetor Float Adjustment tool

Honda 400ex Carburetor Float Adjustment Kit

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