Yamaha's hugely successful WR250F and WR426F 4-stroke enduro bikes have received a host of updates to ensure they stay at the top of the sales charts, a place they made their own during 2001.

The 426 gains updated rear suspension, lighter rim hubs and improved oil flow in the aim of greater reliability.  Also new is a hydro-formed swingarm.  The back brake has come in for attention and is now up to 245mm in diameter.

WR426F SPECIFICATIONS

• Engine - 426cc, 4-stroke, liquid cooled, DOHC 5-valve, forward inclined single cylinder. Dry Sump
• Bore x Stroke - 95.0 x 60.1mm
• Compression Ratio - 12.5:1
• Induction - Keihin FCR39H/1
• Ignition - C.D.I.
• Starting - Kick
• Fuel capacity - 12 litres
• Oil capacity - 1.5 litres
• Gearbox - 5 speed constant mesh
• Length - 2,171mm
• Width - 827mm
• Height - 1,303mm
• Seat Height - 998mm
• Wheelbase - 1,490mm
• Ground Clearance - 373mm
• Dry Weight - 112.5 kg
• Front Suspension - Fully adjustable telescopic forks, 300mm wheel travel
• Rear Suspension - Fully adjustable monocross, 315mm wheel travel
• Front Brake - Single disc 250mm
• Rear Brake - Single disc 245mm
• RRP - $11,099