Misplaced Pages

Yamaha AT1

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Adventure Bike produced by Yamaha motor company

Yamaha AT1

The Yamaha AT1 is a single cylinder enduro motorcycle produced by Yamaha Motor Company from 1969 to 1971. It was part of Yamaha's early efforts to expand their motorcycle lineup and enter the growing off-road market.

Specifications

Yamaha AT1 Specifications
Attribute Value
Engine 123cc, 2-stroke petrol
Bore × Stroke 56 mm × 50 mm
Top speed 60 mph (97 km/h) plus
Power 11.5 BHP at 7,500 rpm
Torque 8.5 ft-lb at 6,000 rpm
Transmission Wet, multiple disc
Suspension Front: Telescopic fork, Rear: Swinging arm
Brakes Internal expansion
Wheelbase 50.6 in (1,290 mm)
Dimensions L: 77.2 in (1,960 mm)
W: 35.8 in (910 mm)
H: 42.9 in (1,090 mm)
Weight 218 lb (99 kg) (dry)
234 lb (106 kg) (wet)
Fuel capacity 1.9 US gal (7.2 L; 1.6 imp gal)
Fuel consumption 141.1 mpg‑US (1.667 L/100 km; 169.5 mpg‑imp) at 25 mph

Models and Versions

The Yamaha AT1 was available in three different models, each corresponding to the year of production:

  1. 1969 Yamaha AT1
  2. 1970 Yamaha AT1B
  3. 1971 Yamaha AT1C

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.

Technical Specifications

Additional Technical Specifications
Specification Value
Compression ratio 7.1:1
Lubrication System Yamaha Autolube
Starting system Electric for Enduro Versions and kick starter
Carburettor VM24SH
Battery 12V 7AH
Ignition system Battery ignition

Model History and Frame Numbers

Model History and Frame Numbers
Model Year Color Frame Numbers
AT1 1969 Pearl White AT1-100101 to AT1-119829
AT1M 1969 Pearl White (MX Version) AT1-300101 to AT1-303790
AT1B 1970 Competition Yellow AT1-119830 to AT1-144709
AT1C 1971 Competition Yellow AT1-144710 to AT1-170509

Parts and Maintenance

Some parts, such as fuel tanks, were interchangeable between the AT1 and other Yamaha models of the same era, like the CT1. Yamaha has continued to support these vintage models by producing replacement parts, such as petcocks, which fit the 1969-1971 AT1 models.

References

  1. ^ "69-71 AT1 125 Specifications". Yamaha Enduros. Retrieved 2024-08-30.
  2. "Yamaha AT1C 125 Enduro Battery Replacement (1969-1971)". Tech Battery Solutions. Retrieved 2024-08-30.
  3. "1969 - 1971 AT1 & CT1 Fuel Tanks Same Size?". Vintage Enduro Discussions. 2021-09-17. Retrieved 2024-08-30.
  4. "Brand New Yamaha Petcocks for our bikes!". Yamaha Enduros. 2014-06-06. Retrieved 2024-08-30.
Yamaha motorcycle timeline, 1950s–1960s
Type 1950s 1960s
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
50 MF-1 MF-2 U5
YF-1 FS-1E
55 YJ-1 YJ-2
60 U6
75 YG-1 YGS-1
U7
90 H1 H3
AT90 HS1
100 L2
125 YA-1 YA-2 YA-3 YA-5 YA-6 AS-1D
130 YB-1
175 YC-1
250 YD-1 YD-2 YD-3
YDS-1 YDS-2 YDS-3 DS5E DS6
260 YE-1 YE-2 YE-3
YES-1 YES-2
305 YM1
350 YR-1 YR-2 YR-3
650 XS-1
125 Trail AT-1
175 Trail CT-1
250 Trail DT-1
Stub icon

This motorcycle, scooter or moped-related article is a stub. You can help Misplaced Pages by expanding it.

Categories: