Welcome to the 1969 Yamaha DT1-B Forum. Feel free to post anything related to this model in the category. The factory Yamaha color was called "Candy Orange". The USA vin range was: DT1-15001 to 42520. Anything new, will be added to this section. 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 DT1B Specifications
Model 1969 Yamaha DT1B
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 35 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
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 2.231 (29/13)
2nd Gear teeth & Ratio 1.624 (26/16)
3rd Gear teeth & Ratio 1.211 (23/19)
4th Gear teeth & Ratio 1.000 (21/21)
5th Gear teeth & Ratio 0.826 (19/23)
Secondary reduction system Chain
Secondary reduction ratio 2.933 (44/15)
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 5.12 In. / 130MM
Braking System:
Type of brake Internal Expansion
Front Operation System Right hand operation
Rear Operation System Right foot operation
Tire Size:
Front 3.25 - 19 - 4PR Trials Universal
Rear 3.50 - 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 DT1B Rider's Manual is Located: CLICK HERE
The 1969 Yamaha DT1-B Service Manual Sup. is Located: CLICK HERE
The 1968 DT1 - 1969 Yamaha DT1B Combined Service Manual is Located: CLICK HERE
The 1968-1971 Yamaha DT1 Combined Service Manual is Located: CLICK HERE
The 1969 Yamaha DT1-B Parts Manual is Located: CLICK HERE
The 1969-1971 Yamaha Autolube adjustment and Color Codes are Located: CLICK HERE
The 1969 Yamaha DT1B Advertisement # 1 is Located: CLICK HERE
The 1969 Yamaha DT1B Advertisement #2 is Located: CLICK HERE
The 1969 Yamaha DT1B Advertisement #3 is Located: CLICK HERE
The 1969 Yamaha DT1B Advertisement #4 is Located: CLICK HERE
The USA 1969 Yamaha DT1B Brochure is Located: CLICK HERE
The USA 1969 Yamaha Line Up Brochure is Located: CLICK HERE
The Germany 1969 Yamaha Line Up Brochure is Located: CLICK HERE
The Factory 1969 Yamaha DT1-B Dealership Poster is Located: CLICK HERE
The 1969 Yamaha Dealership Pocket Book Guide is Located: CLICK HERE
The 1969 Yamaha DT1B Warranty Card is located: CLICK HERE
The 1969 Yamaha DT1-B Store is located above.