To test this feature, visit your live site.

Edited: Jul 28

1969 Yamaha Enduro DT1S / DT1SA 250 Page

in 1969 Yamaha DT1-S

Welcome to the 1969 Yamaha DT1-S / DT1-SA Forum. USA DT1S Model Code 264 & model code 270 for the Australian DT1SA. Feel free to post anything related to this model in the category. Anything new, will be added to this section. The Factory color for the DT1S was: Candy Orange. The USA Vin number range for the DT1S was: DT1-90101 to 91573. If you see any errors, please contact me privately. There were many errors, in the early Yamaha literature. I will make some error's of my own.

1969 Yamaha DT1S Specifications

Model 1969 Yamaha DT1S

Dimensions:

Overall Length 81.1 In. / 2,060MM

Overall Width 35.0 In. / 890MM

Overall Height 44.5 In. / 1,130MM

Wheelbase 53.6 In. / 1,360MM

Min. Ground Clearance 9.6 In. / 245MM

Weight:

Gross 256 Lbs. / 120Kg

Net 232 Lbs. / 109Kg

Performance:

Max, Speed 70 MPH / 112Km/h +

Fuel Consumption 94 MPG @ 25 MPH / 40Km @ 40Km/h

(On paved level roads)

Climbing Ability 37 Degree

Min. Turning Radius 82.6 In. / 2,100MM

Braking Distance 40 Ft. @ 30 MPH (12.5M @ 50Km/h)

Engine:

Model DT1

Type 2 Stroke, Gasoline

Lubricating System Separate (Yamaha Autolube)

Cylinder Single, forward inclined 5 Port

Displacement 15 cu. in. (246cc)

Bore X Stroke 2.77 X 2.52 In. (70MM X 64MM)

Compression Ratio 6.8:1

Max Power 21 BHP/7,000 RPM

Max Torque 16.8 Ft.-Lbs @ 5,000 RPM

Piston Skirt Clearance .0016 - .0018 In. / 0.40 - 0.45MM

Starting System Primary-Coupled Kick

Ignition Timing B.T.D.C 3.2 MM +/- .011 - 0.13 MM

NGK Spark Plug & Gap B-7E (N) 0.5-0.6 MM

Contact Break Point Gap 0.011 - 0.013 Inch / 0.30 - 0.35 MM

Volt Reg. Adjustment -

(Volts @ RPM - No load)

Cutout Relay Adjustment -

Condenser Capacity .22UF (Microfarad)

Carburetor:

Type VM26SH

Main Jet # 160

Jet Needle 5D1 - 3

Air Jet 0.5

Needle Jet 0 - 2

Cut Away 2.5

Pilot Jet (#) 35

Air Screw (turns out) 1 1/2

Starter Jet (#) 60

Float Level 14.1MM

Intake:

Air Cleaner Wet, Foam Rubber

Transmission:

Clutch Wet, Multiple Disk

Primary reduction system Helical Gear

Primary reduction ratio 3.095 / (65/21) Teeth

Trans Oil Capacity 1.06 Qts / 1,000cc

Gear Box:

Type Constant Mesh, 5 Speed Forward

1st Gear teeth & Ratio 2.533 (38/15)

2nd Gear teeth & Ratio 1.789 (34/19)

3rd Gear teeth & Ratio 1.304 (30/23)

4th Gear teeth & Ratio 1.000 (26/26)

5th Gear teeth & Ratio 0.767 (23/30)

Secondary reduction system Chain

Secondary reduction ratio 3.143 (44/14)

Chassis:

Frame Tubular-Double Loop

Front Suspension System Front Telescopic fork

Rear Suspension System Swinging Arm

Fork Oil Capacity 210cc (7.1 Oz.)

Front Cushion System Coil Spring / Oil Damper

Rear Cushion System Coil Spring / Oil Damper

Steering System:

Steering Angle 49 Degrees both left & right

Caster 60.5 Degrees

Trail 137MM

Braking System:

Type of brake Internal Expansion

Front Operation System Right hand operation

Rear Operation System Right foot operation

Tire Size:

Front 2.75 - 21 - 4PR Trials Universal

Rear 4.0 - 18 - 4PR Trials Universal

Front Tire Pressure 14 P.S.I

Rear Tire Pressure 17 P.S.I

Oil Pump:

Adjustment Stroke Min 0.20 - 0.25 MM

Adjustment Stroke Max 1.85 - 2.05 MM

Dynamo:

Model FZA - 1BL

Manufacturer Mitsubishi Elec.

Battery:

Model MV1-6

Manufacturer Nippon Battery

Capacity 6V 2AH

Lighting:

Head Light 6V 35W/35W

Tail Light 6V 5.5W

Stop Light 6V 17W

Meter Light 6V 3W X 2

High Beam Indicator Light 6V 1.5W

Tanks:

Gasoline Tank Capacity 2.5 Gallons

Oil Tank Capacity 1.7 Quarts

Chain:

Tension (Up & down free play) 20MM (25/32)

The 1969 Yamaha DT1S Rider's Manual is Located: CLICK HERE

The 1968-1971 Yamaha DT1 Combined Service Manual is Located: CLICK HERE

The USA 1969 Yamaha DT1-S Parts Manual is Located: CLICK HERE

The Australia 1969 Yamaha DT1-SA Parts Manual is Located: CLICK HERE

The 1969-1971 Yamaha Autolube adjustment and Color Codes are Located: CLICK HERE

The Australia 1969 Yamaha DT1-SA Article is Located: CLICK HERE

The Australia DT1SA price list is located: CLICK HERE

8 comments

Comments (8)

Bruce

Jul 29

•

Excellent Information, thanks for Sharing!

I have 3/4 of a matching numbers DT1SA plus an engine by itself and i am quite interested to see the "station" decal and read about the bike details.

In Australia, the biggest farms are called "stations" either a cattle station or a sheep station for example. The largest is some 5,850,000 acres (9100 square miles) with many others in the millions of acres as well https://en.wikipedia.org/wiki/List_of_the_largest_stations_in_Australia

Perhaps the bike, it's wide ratio gearing and name was aimed at that market??

Enduronut

Jul 29

•

Replying to

Bruce, you are exactly right . . . about it being for the large farms you call stations.

If you look at the Australian Price List (just above the parts page showing the oil lank and STATION sticker), you will see that the bike was tax exempt for farm and agro use.

Bruce

Jul 30

•

Replying to

Looking at the Distributors address on that price list... the warehouse was less than a mile from the first house i ever bought 😯

Enduronut

Jul 25

•

It's a 105 degrees Fahrenheit here today, which kind of forces me to stay indoors, and do other unplanned things ... like contribute to this forum topic.

Devin did a fine job addressing much of what I probably would have said, but I will add a few more comments.

Although the American DT1S and the Australian DT1SA are very similar models that morphed out of the DT1B model, I want to make sure everyone understands they are not identical. First off, they have different Yamaha model prefix numbers. Model 264 for the USA, and model 270 for the Australian version.

As for the high front fender belonging on these two DT1S models . . . no, it never actually happened . . despite a few pictures in the Yamaha riders manual that has led folks to believe so.

The note below is found inside the front cover of some (but not all) DT1S owner manuals.

THEORY: Think about it ... The owners/riders manuals had to be finished and ready to go (printed) when the very 1st DT1S came down the assembly line. At some late point, (just before bike production), Yamaha must have scrapped the idea of a high front fender, and went with the low fender instead .... they weren't about to redo all of the manuals that they had already made.

Furthermore, the parts manual for both models show a low fender, the same part number as used on the DT1B model.

The tachometer gauge on both models was of the larger version that matched the size of the speedometer. The USA DT1S had a 21 inch front tire, whereas the Australian model stayed with the fatter 19 inch tire.

A couple more things . . . the members at the 68/69 DT1 group have been calling the DT1S transmissions "close ratio", when in fact, they are "wide ratio"

(Study the chart further below, and compare the different transmissions ratios.)

Secondly, the "S" in the Australian DT1SA stands for "Station", (not scrambler) as someone had posted on that site. The SA model even had a sticker on the oil tank that identified it as so. The models price list found elsewhere in this DT1S thread, also calls it a Station model. I suspect the "A" stands for Agricultural , but can't prove that ... yet.

I have not seen any proof (either way) that the American model "S" stood for scrambler, but would be happy to learn, if someone can produce Yamaha documentation that clarifies that. 😉

68/69 DT1 A&B Enduros . . . . Exception: 69 DT1-S model

. . . Pinion/Wheel . . . Ratio

1st . . . 13/29 . . . . . . . 2.231

2nd . . . 16/26 . . . . . . 1.625

3rd . . . 19/23 . . . . . . 1.211

4th . . . 21/21 . . . . . . 1.000

5th . . . 23/19 . . . . . . 0.826

Overall Ratio Spread . . . 1.405 = Close Ratio

**************************************

69 DT1S & DT1SA Models

. . . Pinion/Wheel . . . Ratio

1st . . . 15/38 . . . . . . 2.533

2nd . . 19/34 . . . . . . 1.789

3rd . . . 23/30 . . . . . . 1.304

4th . . . 26/26 . . . . . . 1.000

5th . . . 30/23 . . . . . . 0.767

Overall Ratio Spread . . . 1.766 = Wide Ratio

**************************************

70 -74 250/360 - MX Models

. . . Pinion/Wheel . . . Ratio

1st . . . 16/36 . . . . . . . 2.250

2nd . . . 20/33 . . . . . . 1.650

3rd . . . 23/29 . . . . . . 1.261

4th . . . 26/26 . . . . . . 1.000

5th . . . 29/23 . . . . . . 0.793

Overall Ratio Spread . . . 1.457 = Close Ratio

**************************************

. . . 70 -76 250/360/400 Enduro Models

. . . Pinion/Wheel . . . Ratio

1st . . . 15/38 . . . . . . 2.533

2nd . . 19/34 . . . . . . 1.789

3rd . . . 23/30 . . . . . . 1.304

4th . . . 26/26 . . . . . . 1.000

5th . . . 30/23 . . . . . . 0.767

Overall Ratio Spread . . . 1.766 = Wide Ratio

Edited

yamayeeha

Jul 30

•

Replying to

Hi Guys

It's been a while .....I have been out of the loop due to other commitments, but good to come back on board with an Aussie special been on show. I have heard various things about the gearing with the Aus DT1S but Dave and manuals supplied by Devin/this site has cleared that up. Looking through the DT1S parts book all gears are 214 while the DT2 etc with wide ratio gears are made up of 214, 308, 275.

Thanks for all the info.

Good luck with the project Bruce.

Ian

EDIT just realised that I thought Bruce and Rohan were the same person......not paying attention. Hi Bruce, also just worked out who you are....we chatted about the King Valley and Dt1's a few years back.

Hi Devin, great work on the site and looking forward to getting back more on board later in the year - it might be Bruce you have in mind as the owner of the DT1S down in Aus?

Edited

Rohan Wilton

Jul 25

•

Gday. l've got a DT1S that was cloned into a DT1A, sort of. lt came with a pearl white AT1 tank, 19 inch front wheel, low aluminium front guard and the single bolt rear tail light off the DT1A and indicators. l notice the Two Wheels article on the DT1S shows a bike with the low guard. Was the Australian delivered DT1S fitted with the DT1A/B 19 inch wheel and low guard thanks to our ADR. That bike also appears to have the smaller tacho from the 1968 or is just the angle of camera shot. My DT1S has a speedo which l don't recognise and the tacho in the spares box looks like it came off a Japanese Domestic Market DT1A. l would love to get as much info on the Oz delivered DT1S and any pics :)

Enduronut

Jul 25

•

Replying to

Hello Rohan, and welcome to the site

I'll address your questions when I get a bit more time . . . certainly within 2 or 3 days.

Devin

Jul 25

•

Replying to

Welcome! I thought I would chime in. The DT1S is the rarest Enduro.... or as they are known in Australia "Trail". There is very little information, that has been published from Yamaha. I own 2 of them, Enduronut owns one, and Ian Hope owns one, or did own one. Ian Hope is located in Australia.

Here is an Australian DT1SA that was recently sold in an auction:

More pictures of the bike...below link

https://burnsandco.hibid.com/lot/179073294/1969-yamaha-dt1s-250cc?ref=catalog

I do not really post or comment on Facebook, I just observe. I noticed you made a post in one of the groups. I wanted to point out some things I noticed. I am going to share the pictures that you posted on Facebook, to break down what is what.

Your frame vin number does not look off to me, the engine stampings do not look right. I have several pictures of DT1S engine stampings and they do not look like any I have ever seen. Yamaha sold replacement engine cases over the counter. Those replacement cases were blank and you would have to re-stamp them. I suspect that might be what happened with this engine case. If you take the engine apart, and it has a wide ratio transmission, matching the DT1S, that confirms it.

I also noticed that your kick starter is a later model type that was not used on the DT1S. We are based in the USA, so the DT1S models we received might have been slightly different then yours. The Australian models had things such as turn signals and a front fender license plate holder, that we did not have in the USA.

The DT1S rider's manual cover shows the front fender raised, in a high position, but that was just a mock up shot, and it is not bolted to anything. The first year for the high front fender was the 1970 Yamaha DT1M.

The early vin number 1969 Yamaha DT1B's had a few parts that were used on the 1968 Yamaha DT1, such as the exhaust pipe with the stinger. That might have been true for some Australian DT1S's. I am just speculating, I am looking forward to seeing what Enduronut thinks about the different parts.

Here are a few additional pictures, for reference of DT1S stampings.