Yamaha XTZ 660 Tnr


Make Model

Yamaha XTZ 660 Tnr




Four stroke, single cylinder, SOHC, 5 valves per cylinder


660 cc / 40.2 cu-in

Bore x Stroke 100 x 84 mm
Cooling System Liquid cooled,
Compression Ratio 9.2:1
Lubrication Dry sump


TEIKEI  Y 26 PV / 3YF 00


Transistor Controlled 

Starting Electric

Max Power

46 hp / 35.5 kW @ 6000 rpm 

Max Power Rear Tyre

42.9 hp @ 6400 rpm

Max Torque

55.9 Nm / 42 ft. lb @ 5000 rpm


5 Speed 

Final Drive Chain
Gear Ratio 1st 2,583 2nd 1,588 3rd 1,200 4th 0,954 5th 0,792

Front Suspension

43mm Telescopic forks

Rear Suspension

Monocross adjustable for preload, 5-way rebound damping

Front Brakes

Single 282mm disc 4 piston caliper

Rear Brakes

Single 245mm disc 1 piston caliper

Front Tyre


Rear Tyre


Oil Capacity 3.0 Litres
Dimensions Length 2265 mm / 89.1 in
Width 885 mm / 34.8 in
Height 1355 mm / 53.3 in
Wheelbase 1495 mm / 58.9 in
Seat Height 865 mm / 34.1 in
Dry Weight 169 kg / 372.5 lbs

Wet Weight

195 kg / 429 lbs

Fuel Capacity 

20 Litres / 5.3 US gal

Reserve 3.5 Litres

Consumption Average

 16.7 km/lit

Braking 60 - 0 / 100 - 0

 14.7 m / 40.8 m

Standing Mile  

 14.0 sec / 145.3 km/h

Top Speed

 167.5 km/h / 104 mph

Road Test

Tuttomoto 1994

ifth generation: Streamlined
The last generation of the 5-valve XTZ 660 Tnr appeared in 1994. This last evolution had a completely new streamlined bodywork with a dual front headlamp inspired by the famous Super Tnr 750cc twin. There were no significant mechanical changes to engine or chassis.

In 1991 the XTZ660 appeared, the last model of the single cylinder Tnr. This model no longer has much in common with the first Tnr. The petrol tank shrank again to 20 liters and the suspension travel was shortened to 220mm at the front and 200mm at the rear. The whole appearance of the XTZ660 model was lower, heavier and longer than the original 1983 model.

More than the appearance, the new engine characterised this Model. The first single cylinder with five valves provided a agreeable engine characteristic The engine is not quite as flexible as that of the original Tnr, but in the middle and upper range it clearly had more power. The oil tank was moved again into the frame - same as the XT500 - and water-cooling provided more stable engine temperature control. The somewhat longer wheelbase provides better straight line stability at high speed and the dual-piston front disc brake provided better stopping power. 

Altogether the XTZ660 is a good-natured, solid Enduro which does not, however, have much in common with the concept of the first Tnr. For trips on desert routes, which was the original idea, it should only be used with caution. In 1994 Yamaha added a broad fairing with double headlights, but this did not have much impact on sales of the XTZ660 Tnr. Thus production was stopped in 1999.
Yamaha now had no model between the fast twin-cylinder XTZ750 and the new light single cylinder machines.