The Yamaha AT1 is a single cylinder enduro motorcycle produced by Yamaha Motor Company from 1969 to 1971. [1] It was part of Yamaha's early efforts to expand their motorcycle lineup and enter the growing off-road market.
Attribute | Value |
---|---|
Engine | 123cc, 2-stroke petrol [1] |
Bore × Stroke | 56 mm × 50 mm [1] |
Top speed | 60 mph (97 km/h) plus [1] |
Power | 11.5 BHP at 7,500 rpm [1] |
Torque | 8.5 ft-lb at 6,000 rpm [1] |
Transmission | Wet, multiple disc [1] |
Suspension | Front: Telescopic fork, Rear: Swinging arm [1] |
Brakes | Internal expansion [1] |
Wheelbase | 50.6 in (1,290 mm) [1] |
Dimensions | L: 77.2 in (1,960 mm) W: 35.8 in (910 mm) H: 42.9 in (1,090 mm) [1] |
Weight | 218 lb (99 kg) (dry) 234 lb (106 kg) (wet) [1] |
Fuel capacity | 1.9 US gal (7.2 L; 1.6 imp gal) [1] |
Fuel consumption | 141.1 mpg‑US (1.667 L/100 km; 169.5 mpg‑imp) at 25 mph [1] |
The Yamaha AT1 was available in three different models, each corresponding to the year of production: [1]
Each year, the AT1 was also available in the Motocross edition designated by an M. The M models were very similar to the regular models other than a few performance-enhancing features, such as weight reduction, higher compression ratio, tuned exhaust, larger carburettor with 26 mm throttle bore, and tuned gearing ratio. [1]
Specification | Value |
---|---|
Compression ratio | 7.1:1 [1] |
Lubrication System | Yamaha Autolube [1] |
Starting system | Electric for Enduro Versions and kick starter [1] |
Carburettor | VM24SH [1] |
Battery | 12V 7AH [2] |
Ignition system | Battery ignition [1] |
Model | Year | Color | Frame Numbers |
---|---|---|---|
AT1 | 1969 | Pearl White | AT1-100101 to AT1-119829 [1] |
AT1M | 1969 | Pearl White (MX Version) | AT1-300101 to AT1-303790 [1] |
AT1B | 1970 | Competition Yellow | AT1-119830 to AT1-144709 [1] |
AT1C | 1971 | Competition Yellow | AT1-144710 to AT1-170509 [1] |
Some parts, such as fuel tanks, were interchangeable between the AT1 and other Yamaha models of the same era, like the CT1. [3] Yamaha has continued to support these vintage models by producing replacement parts, such as petcocks, which fit the 1969-1971 AT1 models. [4]
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