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DrivetrainĪ 5-speed constant-mesh transmission and a cable-operated wet, multi-plate clutch assembly (with a 1-N-2-3-4-5 gearshift pattern) deliver power to the ground.
2007 HONDA 400EX SWING ARM PROFESSIONAL
Consult a professional mechanic if engine pinging persists. But if it occurs under normal riding conditions and at steady engine speeds, change fuel brands at once. Although slight pinging should be no cause for worry when riding your 2004 Honda 400EX up a hill or under a heavy load.
To avoid pinging or spark knock, never use lower-octane gasoline.
2007 HONDA 400EX SWING ARM PRO
For top performance, use Pro Honda GN4/HP4 motor oils with an API grade of SJ+ (without graphite or molybdenum additives) meeting JASO T903 MA standards. Fuel & Lubricationįuel tank capacity is 2.64 US gallons/10 liters (inclusive of a 0.42-US gallon/1.6-liter reserve) of unleaded gasoline with a minimum PON 92 rating, containing < 5% MTBE (Methyl Tertiary Butyl Ether), < 10% ethanol, or < 5% methanol.Īs for engine oil, Honda recommends 1.7 liters (1.8 US quarts – after draining) of SAE 10W-40 oil or its equivalent. Some find the machine’s low-end torque lacking, but changing ratios to 14/38, 15/39, or 14/39 and adding a Dynatech CDI box would give you the pull you need. Thanks to RFVC (Radial Four-Valve Combustion Chamber) and an XR400R-adopted power mill, the 2004 Honda 400EX supports a top speed of 72 mph (116 km/h) and a horsepower of 28 RWHP (20.59 kW). A 38-mm piston valve with an accelerator pump handles the air-fuel mixture and mates to a compression ratio of 9.1:1 and dry-sump lubrication. 2004 Honda 400EX Specs & Features EngineĪ 397-cm3 (24.23 in3) RFVC air-cooled single-cylinder 4-stroke engine with a bore-stroke ratio of 85 × 70 mm (3.35 × 2.76 inches) brings the Sportrax TRX400EX to life. Conquering the Baja 1000 fresh from the warehouse further proved how well this engine worked with a redesigned ATV framework. And since the XR400R received such critical acclaim, Honda decided to use its powerplant as the heart of the TRX 400EX. With these new challenges in mind, Honda decided to address the consumer’s pent-up demand for a new machine that could satisfy the whims of thrill-seeking racers as well as recreational riders. But if the Japanese firm learned anything from the past decade, vehicle regulations will only get stricter and competition only tighter. Sure, 2-strokes were still widespread in the market. While most companies were cautious not to trigger another Consent Decree, Honda was busy cooking up the next-generation 4-stroke ATVs. In a big way, the Sportrax rekindled the riding community’s then waning desire for sport riding. Although not as powerful as present-day 450-cc speedsters, this pure-sport machine was responsible for the resurgence of sport-quad racing shortly after the 10-year ATC Ban suffered by manufacturers across the globe. The 2004 Honda 400EX is the 6th installment of the 400-class Sportrax lineup first introduced in 1999. Continue reading this guide and learn more about the specs, notable features, and how this ground-breaking machine changed the sport-ATV scene forever. Boasting a 397-cc XR400R-inspired engine, Pro-Link rear suspension, 72-mph top-speed rating, and aggressive styling, the quad continues to ride high in today’s ATV market.īy conquering the Baja 1000 out of the gate, the Honda 400EX bravely put an end to the aftermath of the 1988 Consent Decree, eventually paving the way for 450-cc racing quads that we know of today. Sportrax 400EX) is a pure-sport 4×4 responsible for the renaissance of the Sport-ATV segment. Aggressively-styled and fast, this wheeler signaled the revival of the sport-ATV segment and the beginning of 4-stroke quads. TRX400EX or Sportrax) was an important milestone in developing current sport quads. Hailing from one of the industry’s longest-running ATV lineups, the 2004 Honda 400EX (a.k.a.
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