| MODEL | YAMAHA YR-3C 1969 - 1970 |
| Year | 1969 - 1970 |
| Engine Type | Two-stroke, parallel twin |
| Displacement / Capacity | 347 cc / 21.1 cu in |
| Bore X Stroke | 61 x 59.6 mm |
| Compression Ratio | 7.5:1 |
| Cooling System | Air cooled |
| Max Power | 36.5 hp / 27.2 kW @ 7500 rpm |
| Max Torque | 3.3 kgf-m / 23.9 ft-lb @ 7000 rpm |
| Ignition | — |
| Induction | Carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 2040 mm / 80.3 in |
| Overall Width | 735 mm / 28.9 in |
| Overall Height | 1005 mm / 39.5 in |
| Seat Height | — |
| Wheelbase | 1340 mm / 52.7 in |
| Ground Clearance | 145 mm / 5.7 in |
| Dry Weight | — |
| Wet Weight | 157 kg / 346 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.00-18 |
| Rear Tyre | 3.50-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 4.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The YR-3C carried Yamaha's air-cooled 350 cc two-stroke twin through 1969 and 1970. In the listed figures it is slightly shorter and a little longer in the wheelbase than the YR-2C, and it keeps the five-speed gearbox, drum brakes and 18-inch wheels. It sits between the early YR bikes and the R5 that followed.
