Honda 400 Overview


The light bulb went on. Revamping his ST70 based prototype to accept the new low pressure rolling stock, he went to work on his own tire design, ending up with a 22 inch tire inflated to 2. 2 psi. With the tire dilemma solved, the 70cc engine lacked the muscle necessary to push a full sized rider through snow or mud. A 90cc engine running through a special dual range four speed gearbox added the requisite flexibility over varied terrain. The next phase of development was optimizing the chassis to match the new engine and tires.

Honda Trx400ex TRX 400ex 440cc Big Bore Cylinder Piston Rings Top End Kit 99-08


Honda Trx400ex TRX 400ex 440cc Big Bore Cylinder Piston Rings Top End Kit 99-08

$94.95

Honda TRX400EX 1999-2004 Tusk Clutch Kit Heavy Duty Springs & Cover Gasket


Honda TRX400EX 1999-2004 Tusk Clutch Kit Heavy Duty Springs & Cover Gasket

$62.95

Honda Trx400ex TRX 400EX Cyinder Piston Gasket Rings Top End Kit Set 1999-2008


Honda Trx400ex TRX 400EX Cyinder Piston Gasket Rings Top End Kit Set 1999-2008

$74.95

Honda TRX 400EX 400X Top End Rebuild Repair Kit Wiseco Piston Gaskets Cylinder


Honda TRX 400EX 400X Top End Rebuild Repair Kit Wiseco Piston Gaskets Cylinder

$239.99

Honda trx 400ex Hotcams stage 2 nice high performance cam


Honda trx 400ex Hotcams stage 2 nice high performance cam

$84.99

Honda TRX 400EX Wiring Harness Loom OEM


Honda TRX 400EX Wiring Harness Loom OEM

$44.95

HONDA TRX 400 EX HEADLIGHT OEM 1999-2004


HONDA TRX 400 EX HEADLIGHT OEM 1999-2004

$45.00

For Honda Sportrax TRX400EX 400EX Cylinder Piston Gasket Top End Kit 99-08 2001


For Honda Sportrax TRX400EX 400EX Cylinder Piston Gasket Top End Kit 99-08 2001

$51.48

Honda TRX400EX TRX 400EX Air Engine Cooler Shrouds Scoop Kit CFM Performance


Honda TRX400EX TRX 400EX Air Engine Cooler Shrouds Scoop Kit CFM Performance

$54.95

HONDA 400EX HD HEAD STUDS -  Stripped or Blown Head Gasket Fix - TRX400EX XR400


HONDA 400EX HD HEAD STUDS - Stripped or Blown Head Gasket Fix - TRX400EX XR400

$52.99

Honda 400EX AIR SHROUDS w/ BOLTS AIR Engine Cooler Scoop Kit NEW FAST SHIP!!!


Honda 400EX AIR SHROUDS w/ BOLTS AIR Engine Cooler Scoop Kit NEW FAST SHIP!!!

$53.99

HONDA TRX400ex 1999-2007 SEAT COVER in Black or 25 Colors   (HONDA SIDES)


HONDA TRX400ex 1999-2007 SEAT COVER in Black or 25 Colors (HONDA SIDES)

$39.99

99-08 Honda 400ex Cylinder Head OEM


99-08 Honda 400ex Cylinder Head OEM

$79.99

G&S Racing Cylinder Head Rebuild Repair Kit HONDA TRX400EX 1999-2008 valves


G&S Racing Cylinder Head Rebuild Repair Kit HONDA TRX400EX 1999-2008 valves

$59.95

Honda sportrax Trx400ex TRX 400EX Cylinder Head Valve Cover 1999-2008 99-08


Honda sportrax Trx400ex TRX 400EX Cylinder Head Valve Cover 1999-2008 99-08

$149.95

Honda TRX 400EX Gas Tank Heat Shield Guard Protector Fuel OEM


Honda TRX 400EX Gas Tank Heat Shield Guard Protector Fuel OEM

$39.95

Honda TRX400EX TRX 400EX Stock Bore OEM Rep Cylinder Piston Top End Rebuild Kit


Honda TRX400EX TRX 400EX Stock Bore OEM Rep Cylinder Piston Top End Rebuild Kit

$129.99

For Honda Sportrax TRX400EX 400EX Cylinder Piston Gasket Top End Kits 1999-2008


For Honda Sportrax TRX400EX 400EX Cylinder Piston Gasket Top End Kits 1999-2008

$66.28

[SR] HONDA TRX400EX & TRX400X RADIATOR AIR DUCT SCOOPS 93-04 (Brushed Aluminum)


[SR] HONDA TRX400EX & TRX400X RADIATOR AIR DUCT SCOOPS 93-04 (Brushed Aluminum)

$45.95

[SR] Heavy Duty Aluminum HONDA TRX400EX & TRX400X RADIATOR AIR DUCT SCOOPS 93-04


[SR] Heavy Duty Aluminum HONDA TRX400EX & TRX400X RADIATOR AIR DUCT SCOOPS 93-04

$45.95

HONDA TRX400EX TRX 400EX  Cylinder Head Repair KIT Rocker Arm Valve 1999-2015


HONDA TRX400EX TRX 400EX Cylinder Head Repair KIT Rocker Arm Valve 1999-2015

$64.99

1999-2015 HONDA 400EX ROTOR REAR BRAKE HUB DISC HEAVY DUTY UPGRADED!! BRAND NEW


1999-2015 HONDA 400EX ROTOR REAR BRAKE HUB DISC HEAVY DUTY UPGRADED!! BRAND NEW

$139.99

Honda TRX400EX TRX 400X  85mm STD BORE PISTON w/RIKEN RING SET Fit 1999-15


Honda TRX400EX TRX 400X 85mm STD BORE PISTON w/RIKEN RING SET Fit 1999-15

$39.99

FOR Honda TRX 400 Rancher Carburetor/Carb TRX400FA TRX400FGA G/SCAPE 2007 NEW


FOR Honda TRX 400 Rancher Carburetor/Carb TRX400FA TRX400FGA G/SCAPE 2007 NEW

$66.99

1999-2014 for Honda 400EX 400 Factory Carburetor Assy 16100-HN1-A43 ATV


1999-2014 for Honda 400EX 400 Factory Carburetor Assy 16100-HN1-A43 ATV

$48.94

Honda TRX400EX 400X 2005-2014 Tusk Clutch Kit Heavy Duty Springs & Cover Gasket


Honda TRX400EX 400X 2005-2014 Tusk Clutch Kit Heavy Duty Springs & Cover Gasket

$68.95

2001 Honda TRX400EX 400EX Twin Row Bearing Carrier-High Quality Fit All Year


2001 Honda TRX400EX 400EX Twin Row Bearing Carrier-High Quality Fit All Year

$39.99

HONDA TRX400EX Seat Cover 1999-2007 in 2-tone RED & BLACK  (HONDA SIDES)


HONDA TRX400EX Seat Cover 1999-2007 in 2-tone RED & BLACK (HONDA SIDES)

$39.99

Honda Trx400ex TRX 400EX Performance Cam Shaft Camshaft 1999-2008


Honda Trx400ex TRX 400EX Performance Cam Shaft Camshaft 1999-2008

$39.95

Cylinder Piston Gasket Top End Kit for Honda Sportrax TRX400EX 1999-2008


Cylinder Piston Gasket Top End Kit for Honda Sportrax TRX400EX 1999-2008

$71.95

Honda Trx400ex TRX400 PERFORMANCE Complete Cylinder Head Camshaft 1999-2008


Honda Trx400ex TRX400 PERFORMANCE Complete Cylinder Head Camshaft 1999-2008

$319.95

99 - 15 Honda 400 EX Motor Engine Crankshaft Crank Shaft Rod 13000-MBV-730 00 01


99 - 15 Honda 400 EX Motor Engine Crankshaft Crank Shaft Rod 13000-MBV-730 00 01

$81.76

NEW HONDA 400 450 FOREMAN LEFT REAR HUB RANCHER 350 TRX350 TRX450 TRX400 TRX500


NEW HONDA 400 450 FOREMAN LEFT REAR HUB RANCHER 350 TRX350 TRX450 TRX400 TRX500

$48.77

HONDA TRX 400EX 1999–2004 Tusk Clutch Kit Gasket Springs Friction Plates


HONDA TRX 400EX 1999–2004 Tusk Clutch Kit Gasket Springs Friction Plates

$58.65

HONDA TRX400EX 400EX UNIVERSAL SEAT LATCH *NEW


HONDA TRX400EX 400EX UNIVERSAL SEAT LATCH *NEW

$39.99

Honda TRX400EX 400EX Start Light Kill Switch Atv 1999-2004 NEW!!


Honda TRX400EX 400EX Start Light Kill Switch Atv 1999-2004 NEW!!

$49.95

HONDA TRX400EX TRX 400EX  85mm STOCK BORE CYLINDER PISTON GASKET KIT 1999-2015


HONDA TRX400EX TRX 400EX 85mm STOCK BORE CYLINDER PISTON GASKET KIT 1999-2015

$69.99

2001 Honda TRX400EX Clutch Basket Pressure Plate Boss Hub Disc Assembly 99-04


2001 Honda TRX400EX Clutch Basket Pressure Plate Boss Hub Disc Assembly 99-04

$130.00

GENUINE HONDA 400EX AIR BOX COMPLETE 1999-2015 TRX Lid Intake snorkel FAST SHIP


GENUINE HONDA 400EX AIR BOX COMPLETE 1999-2015 TRX Lid Intake snorkel FAST SHIP

$159.99

 NEW Honda TRX400EX TRX 400EX Cylinder Head  1999-2008


NEW Honda TRX400EX TRX 400EX Cylinder Head 1999-2008

$156.99

Honda Trx400ex TRX 400ex 440cc Big Bore Cylinder Complete Head Camshaft 99-08


Honda Trx400ex TRX 400ex 440cc Big Bore Cylinder Complete Head Camshaft 99-08

$399.95

HONDA 400EX SEAT 2004-2007 BRAND NEW GENUINE HONDA SEAT TRX 400 FAST SHIP


HONDA 400EX SEAT 2004-2007 BRAND NEW GENUINE HONDA SEAT TRX 400 FAST SHIP

$79.99



Production of three wheelers ceased in 1987 due to safety concerns: three wheelers were more unstable than four wheelers although accidents are equally severe in both classes. The duration of the voluntary cease of production manufacturers were not required to halt production but agreed to it lasted 10 years and thus since 1997, manufacturers were free to once again manufacture and market three wheelers. A ban on sales of new or used three wheelers and a recall of all remaining three wheelers has been proposed by the American Academy of Pediatrics. However, it was determined in a CPSC study that three wheelers are no more dangerous than other ATV's. The ban lead to widespread thought that the machines are unregistrable, uninsurable, dangerous, and even illegal, but is false. These safety issues with three wheel ATVs caused all ATV manufacturers to upgrade to four wheel models in the late 1980s, and three wheel models ended production in 1988, due to consent decrees between the major manufacturers and the Consumer Product Safety Commission—the result of legal battles over safety issues among consumer groups, the manufacturers and CPSC. The lighter weight of the three wheel models made them popular with expert riders. Cornering is more challenging than with a four wheeled machine because leaning into the turn is even more important, to counterbalance the weight and keep the machine stable. Operators may roll over if caution isn't used at high speeds. The front end of three wheelers obviously has a single wheel, making it lighter, and flipping backwards is a potential hazard, especially when climbing hills. Rollovers may also occur when traveling down a very steep incline.


Recent Deals:

Honda Trx400ex TRX 400ex 440cc Big Bore Cylinder Piston Rings Top End Kit 99-08Honda TRX400EX 1999-2004 Tusk Clutch Kit Heavy Duty Springs & Cover GasketHonda Trx400ex TRX 400EX Cyinder Piston Gasket Rings Top End Kit Set 1999-2008Honda TRX 400EX 400X Top End Rebuild Repair Kit Wiseco Piston Gaskets CylinderHonda trx 400ex Hotcams stage 2 nice high performance camHonda TRX 400EX Wiring Harness Loom OEMHONDA TRX 400 EX HEADLIGHT OEM 1999-2004For Honda Sportrax TRX400EX 400EX Cylinder Piston Gasket Top End Kit 99-08 2001Honda TRX400EX TRX 400EX Air Engine Cooler Shrouds Scoop Kit CFM PerformanceHONDA 400EX HD HEAD STUDS - Stripped or Blown Head Gasket Fix - TRX400EX XR400Honda 400EX AIR SHROUDS w/ BOLTS AIR Engine Cooler Scoop Kit NEW FAST SHIP!!!HONDA TRX400ex 1999-2007 SEAT COVER in Black or 25 Colors (HONDA SIDES)99-08 Honda 400ex Cylinder Head OEMG&S Racing Cylinder Head Rebuild Repair Kit HONDA TRX400EX 1999-2008 valvesHonda sportrax Trx400ex TRX 400EX Cylinder Head Valve Cover 1999-2008 99-08Honda TRX 400EX Gas Tank Heat Shield Guard Protector Fuel OEMHonda TRX400EX TRX 400EX Stock Bore OEM Rep Cylinder Piston Top End Rebuild KitFor Honda Sportrax TRX400EX 400EX Cylinder Piston Gasket Top End Kits 1999-2008[SR] HONDA TRX400EX & TRX400X RADIATOR AIR DUCT SCOOPS 93-04 (Brushed Aluminum)[SR] Heavy Duty Aluminum HONDA TRX400EX & TRX400X RADIATOR AIR DUCT SCOOPS 93-04HONDA TRX400EX TRX 400EX Cylinder Head Repair KIT Rocker Arm Valve 1999-20151999-2015 HONDA 400EX ROTOR REAR BRAKE HUB DISC HEAVY DUTY UPGRADED!! BRAND NEWHonda TRX400EX TRX 400X 85mm STD BORE PISTON w/RIKEN RING SET Fit 1999-15FOR Honda TRX 400 Rancher Carburetor/Carb TRX400FA TRX400FGA G/SCAPE 2007 NEW1999-2014 for Honda 400EX 400 Factory Carburetor Assy 16100-HN1-A43 ATVHonda TRX400EX 400X 2005-2014 Tusk Clutch Kit Heavy Duty Springs & Cover Gasket2001 Honda TRX400EX 400EX Twin Row Bearing Carrier-High Quality Fit All YearHONDA TRX400EX Seat Cover 1999-2007 in 2-tone RED & BLACK (HONDA SIDES)Honda Trx400ex TRX 400EX Performance Cam Shaft Camshaft 1999-2008Cylinder Piston Gasket Top End Kit for Honda Sportrax TRX400EX 1999-2008Honda Trx400ex TRX400 PERFORMANCE Complete Cylinder Head Camshaft 1999-200899 - 15 Honda 400 EX Motor Engine Crankshaft Crank Shaft Rod 13000-MBV-730 00 01NEW HONDA 400 450 FOREMAN LEFT REAR HUB RANCHER 350 TRX350 TRX450 TRX400 TRX500HONDA TRX 400EX 1999–2004 Tusk Clutch Kit Gasket Springs Friction PlatesHONDA TRX400EX 400EX UNIVERSAL SEAT LATCH *NEWHonda TRX400EX 400EX Start Light Kill Switch Atv 1999-2004 NEW!!HONDA TRX400EX TRX 400EX 85mm STOCK BORE CYLINDER PISTON GASKET KIT 1999-20152001 Honda TRX400EX Clutch Basket Pressure Plate Boss Hub Disc Assembly 99-04 GENUINE HONDA 400EX AIR BOX COMPLETE 1999-2015 TRX Lid Intake snorkel FAST SHIP NEW Honda TRX400EX TRX 400EX Cylinder Head 1999-2008Honda Trx400ex TRX 400ex 440cc Big Bore Cylinder Complete Head Camshaft 99-08HONDA 400EX SEAT 2004-2007 BRAND NEW GENUINE HONDA SEAT TRX 400 FAST SHIP