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Make ModelYamaha WR 450F 2-Trac
Year: 2004
Engine: liquid cooled, four stroke, single cylinder, DOHC, 5 titanium valve per cylinder.
Capacity: 449
Bore x Stroke: 95 x 63.4 mm
Compression Ratio: 12.5:1
Induction: 39mm Keihin FCR flat-slide throttle position sensor
Ignition / Starting: Digital CDI /
Max Power: 58 hp 42.3 kW @ 9000 rpm
Max Torque: 49 Nm @ 7000 rpm
Transmission / Drive: 5 Speed / chain
Front Suspension: 46mm Kayaba inverted telescopic fork compression and rebound damping adjustable. 300mm wheel travel.
Rear Suspension: Fully adjustable Kayaba single shock, 315mm wheel travel, separate speed compression adjustment
Front Brakes: Single 250mm disc 4 piston calipers
Rear Brakes: Single 245mm disc 2 piston caliper
Front Tire: : 80/100-21
Rear Tire: : 110/100-18
Dry-Weight: 8 Litres
Fuel Capacity:
ReviewsMotociclismo
Yamaha France flew just a handful of journalists to Laayoune, in Southern Morocco to test the 2-Trac on part of the course of the Shamrock Rally, where they already had two works 2-Trac machines competing in the week-long event.
Four of us had two days sharing two 2-trac machines and two conventionally driven WR450s, swapping between them at will. All four machines had the full complement of Ohlins equipment, so we were able to make a fair assessment of the pros and cons of two wheel drive in a whole variety of conditions, from huge soft dunes to salt lakes and ‘flat-out’ but stony desert with plenty of treacherous rocks hidden by the scrub and sand. We covered a full lap of the rally course on each of the two days, some 400kms in all, with extra excursions into the dunes for photographs and 1WD vs 2WD comparisons.
The first day’s terrain was a mixture of dunes and rocky going, but also included a 40km thrash down the beach, while the second day started and finished with 50kms of tarmac road and included some higher dunes, a rocky plateau and camel-inhabited scrubland.
In view of all the fast going, the test bikes were fitted with tall 15/47 front and rear sprockets instead of the standard 14/50 gearing.
In simple terms the two wheel drive system can be explained as follows: The gearbox output sprocket drives a short, fully enclosed chain to a pump, which in turn pushes the oil (not hydraulic fluid) to the front hub via the pipe and back via the parallel pipe. There’s no drive at all until the rear wheel starts to spin and only a maximum of 15% of the power goes to the front at any time.
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