Yamaha TDM

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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.

1 Version History
2 Performance
3 Specifications
- 3.1 Engine
- 3.2 Chassis
4 External links

[edit] 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.

[edit] Performance

Top speed around 230 km/h 0-100 km/h, around 3.8 sec.

[edit] 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