Jun 29, 2012 I just got this bike from my grandpa. It was sitting up north for a few years since the last time it was used. Currently, it will start up and run for a bit, but after a few it bogs out. To me it seems like its not getting enough gas. The carburetor has been cleaned out and I have checked pretty. OEM is an acronym for original equipment manufacturer, which means that the 1970 Yamaha HT1 OEM parts offered at BikeBandit.com are genuine Yamaha parts. Genuine parts give 1970 Yamaha HT1 owners the ability to repair or restore a broken down or damaged machine back to the condition it first appeared in on the showroom floor. Dec 15, 2012 So I have an opportunity to get a hold of an old Yamaha 90 HT-1 that’s in decent shape but was hoping I could get some insight on what to look at on these older bikes. I'm sure there are forums for it. You may have better luck searching those out. 90% of the running gear that you'll be worried about is the same. Its a 1970 HT1. The DT-1 was an instant sensation, selling almost 50,000 units in the first year alone and quickly spawned an entire family of off road bikes. By 1971, the range had grown to include a 90 (the HT-1 offered here), a 125 (AT-1), 175 (CT-1), 250 (DT-1) and 360 (RT-1), not to mention several tiny 'mini trail' bikes with even smaller capacity engines. Aug 26, 2017 This feature is not available right now. Please try again later. 1970 1971 Yamaha. 1970 1971 Yamaha Ht1 Ht1b Factory Oem New Wire Harness Complete. 1971 Used Yamaha Ht1-b Service Manual Guide Book Ht1b Ht1 B Printed 1970 70 71. Are you trying to find 1970 yamaha ht1 enduro values? The Hagerty motorcycle valuation tool® is designed to help you learn how to value your 1970 yamaha ht1 enduro and assess the current state of the classic motorcycle market.
| Manufacturer | Yamaha Motor Company |
|---|---|
| Parent company | Yamaha |
| Production | 1969–1971 |
| Predecessor | n/a |
| Successor | AT2, AT3 |
| Class | Enduro |
| Engine | 123cc, 2-stroke gasoline |
| Top speed | 60 mph (97 km/h) plus |
| Power | 11.5 BHP/7,500 r.p.m |
| Torque | 8.5 ft-lb/6000 r.p.m |
| Transmission | Wet, multiple disc |
| Suspension | Front: Telescopic fork, Rear: Swinging arm |
| Brakes | Internal expansion |
| Tires | Front: 3.00-18-4PR, Rear:3.25-18-4PR |
| 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) |
| Oil capacity | 1.3 qts |
| Fuel consumption | 141.1 mpg‑US (1.667 L/100 km; 169.5 mpg‑imp) at 25 mph |
| Turning radius | 75.1 in (1,910 mm) |
The Yamaha AT1 is a single cylinder enduro/adventure bike produced by Yamaha motor company from 1969-1971. The AT1 was marketed towards beginners due to its small engine size and the fact that it had electric start.
The Yamaha AT1 was available in three different models, each corresponding to the year of production. 1969 Yamaha AT1, 1970 Yamaha AT1B, 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 carburetor with 26 mm throttle bore, tuned gearing ratio, etc.
Engine and transmission[edit]
1970 Yamaha Ht1 90 Manual Download Pdf
| Bore & Stroke | 56 x 50mm |
| Compression ratio | 7.1:1 |
| Lubrication System | Yamaha Autolube |
| Starting system | Electric for Enduro Versions and kick starter |
| Carburetor | VM24SH |
| Battery | 12V 7AH |
| Ignition system | Battery ignition |
1970 Yamaha Ht1 90 Manual Download Video
Models and VIN[edit]
| AT1 1969 Pearl White | AT1-100101 to AT1-119829 |
| AT1M 1969 MX Version Pearl White | AT1-300101 to AT1-303790 |
| AT1B 1970 Competition Yellow | AT1-120101 to AT1-138890 |
| AT1M-B 1970 MX Version Competition Yellow | AT1-310101 to AT1-312326 |
| AT1C 1971 Brilliant Red | AT1-139101 to AT1-162879 |
| AT1M-C 1971 MX Version Brilliant Red | AT1-313101 to AT1-317191 |