YAMAHA R5 1970-1972
Tune Up and Specs
General Specifications:
| Model |
R5 |
| Dimensions |
|
| Overall Length |
80.3 in. (2,040mm) |
| Overall Width |
32.9 in (835mm) |
| Overall Height |
42.7 in (1,085mm) |
| Wheelbase |
52.0 in (1,320mm) |
| Min. Ground Clearance |
6.1 in (155mm) |
| Weight |
|
| Net |
311 lbs (141 kg) |
| Gross |
343 lbs (155 kg) |
| Performance |
|
| Max Speed |
100 mph plus (160km/h plus) |
| Fuel Consumption |
82.5 mpg at 37mph (35 km/lit at 60 km/h) |
| Climbing Capacity |
28 degrees |
| Min. Turning Radius |
90.6 in. (2,300mm) |
| Braking Distance |
46 ft at 31 mph (14m at 50 km/h) |
| 1/4 mile |
13.8 seconds |
| Engine |
|
| Type |
R5 2 Stroke Air Cooled |
| Cylinder |
Two in Parallel Forward Inclined, 5 Port |
| Lubrication System |
Separate Lubrication (Yamaha Autolube) |
| Displacement |
21.18 cu.in. (347cc) |
| Bore & Stroke |
2.520 x 2.126 in. (64 x 54 mm) |
| Compression Ratio |
6.9 : 1 |
| Max. Output |
36 bhp @7000 rpm |
| Max. Torque |
28.0 ft/lbs. @ 6,500 rpm 3.87 kg-m @6,500 rpm |
| Starting System |
Kick Starter |
| Ignition System |
Battery Ignition |
| Carburator |
VM28SC x 2 |
| Air Cleaner |
Dry Paper Filter Type |
|
Transmission
|
R5
|
R5B
|
|
Primary Reduction Ratio and Method
|
66/23 2.869 gear
|
68/23 2.869 gear
|
|
Secondary Reduction Ratio and Method
|
40/15 2.666 chain
|
40/15 2.666 chain
|
|
1st
|
2.562
|
2.562
|
|
2nd
|
1.590
|
1.590
|
|
3rd
|
1.192
|
1.192
|
|
4th
|
.965
|
.965
|
|
5th
|
.806
|
.8064
|
| Electrical | R5 | R5B | R5C |
| Ignition timing BTDC Advanced (mm) | 2.0mm +/- 0.15mm | 2.0mm +/- 0.15mm | 2.0mm +/- 0.15mm |
| Breaker Point Gap mm/inch | .30-.35mm .011-.013" | .30-.40mm .012-.015" | .30-.40mm .012-.015" |
| Spark Plug and Gap | B9HC .5-.6 mm | B9HC .5-.6 mm | B8HS .5-.6mm .070- .074" |
| Charging System | Alternator | Alternator | |
| Condenser Capacity microfarad | 22uF | 22uF | |
| Battery Voltage (volts) | 12v | 12v | 12v |
| Battery Type | Yuasa 12N5.5A-3B | Yuasa 12N5.5A-3B | Yuasa 12N5.5A-3B |
| Turn signal bulb V/W | 12V 27W | 12V 27W | 12V 27W |
| Head Light V/W | 12v __w | ||
| Tail Light | 12v 23 / 8 W | 12v 27 / 8 W | 12v 27 / 8 W |
| Guage Bulbs | 12v 3.4w | 12v 3.4w | 12v 3.4w |
| Tire Size | Inches | _____ | Front Sprocket | ?? |
| Front | 3.00x18" | _____ | Rear Sprocket | 40 tooth |
| Rear | 3.50x18" | _____ | Chain | 525T 92 Links |
| Carburator | R5 | R5B | R5C | Optional |
| Pilot | #40 | #40 | #30 | ?? |
| Main | #110 | #110 | #120 | #100 #130 |
Front Brake Shoes: Set the Brake shoe and measure the outer diameter of the shoe with slide calipers if shoe is less than 175mm (6.9 in.) replace the shoes
Any questions or info to be added please email me at
r5@togobeyond.net
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