Yamaha TDM850

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Yamaha TDM 850
Yamaha TDM 850 Facelift Model (Mk 2)

The Yamaha TDM is an 849 cc two-cylinder motorcycle, manufactured by the Yamaha Motor Company of Japan, that first came out in 1991. With a lot of torque, and 78 horsepower, it is considered to be a very good all-rounder.

Version History

It was imported into the United States for only two years, 1992 and 1993.

It was never a big seller in the United Kingdom but in Northern Europe sales were very strong. In 1996 Yamaha released the Mk2 TDM with updated bodywork and a 270 degree instead of a 360 degree firing order. This upgraded engine was first seen on the Japanese market in 1995, when Yamaha introduced the TRX850.

In 2001 the Mk3 TDM arrived, again with new bodywork, 6 speed gearbox, fuel injection, R1 derived brakes and bored out to 900cc. Also it incorporates a diamond shaped aluminum frame.

The TDM is classified as Dual Sports or Adventure Sports. Its engine was derived from the Paris Dakar winning Yamaha XTZ 750 Super Tenere. Although too large and heavy for serious off-road work, the TDM has a long travel suspension and is well suited for gravel tracks and light off-road use. Popular modifications include fitting R1 brake calipers, luggage racks and dual sports tires.

Performance

Top speed around 220 km/h 0-100 km/h, around 3.8 sec.

Specifications

Engine

Type 4-stroke, DOHC, liquid-cooled
Forward Inclined Parallel 2-cylinder
Displacement 849 cc
Bore x Stroke 89.5 x 67.5 mm
Compression Ratio 10.5:1
Maximum power 78 bhp (56.6 kW)@ 7500 rpm
Maximum Torque 8.1 kg-m @ 6000 rpm
Starting System Electric
Lubrication Dry sump
Carburation MIKUNI BDST38/2
Primary Reduction Ratio 67/39 (1.718)
Secondary Reduction Ratio 42/17 (2.471)
Clutch type Multiple disc , Wet
Transmission Type Constant mesh 5-speed
Gear Ratio 1st 37/13 (2.846)
Gear Ratio 2nd 37/20 (1.850)
Gear Ratio 3rd 30/21 (1.429)
Gear Ratio 4th 27/23 (1.174)
Gear Ratio 5th 28/27 (1.037)
Ignition System T.C.I. (digital)
Final Transmission Chain


Chassis

Overall Length 2170 mm
Overall Width 780 mm
Overall Height 1280 mm
Seat Height 795 mm
Wheelbase 1470 mm
Minimum Ground Clearance 160 mm
Dry Weight 198 kg
Frame Type Steel, diamond shaped
Caster Angle 25°
Trail 105 mm
Fuel Tank Capacity 20 L
Front Suspension Telescopic fork 41mm
Rear Suspension Swinging arm (monocross)
Front Wheel MT3.00 x 18, Aluminum
Front Wheel Travel 149 mm
Rear Wheel MT4.00 x 17, Aluminum
Rear Wheel Travel 140 mm
Front Brake Dual discs, 298 mm diam
Rear Brake Single disc, 245 mm diam
Front tyre 110/80 ZR18
Rear tyre 150/70 ZR17

External links