Yamaha R5 350 (1971)

The Yamaha R5-B 350 was produced in 1971 with piston port two-stroke technology and a parallel twin cylinder engine. The capacity of the engine is 347 cc, and its compression ratio is 7.5:1. The cooling system is air-cooled, and oil injection provides oil. The induction is equipped with two Mikuni VM28 SC carburetors. The battery-controlled ignition uses dual coils and a breaker point system, and the motorcycle starts with a kick. The maxi power provided by the motorcycle is 26.8 kW or 36 hp at 7000 rpm, while the maximum torque is 37.9 Nm or 3.87 kgf-m or 28 ft-lb at 6500 rpm. The clutch is multi-plate and wet, and the motorcycle has a five-speed transmission with a chain final drive. The front suspension is a telescopic fork, while the rear suspension has a swingarm. The front brakes are a drum with twin leading shoe, and the rear brakes have a drum with a single leading shoe. The width of the motorcycle is 739 mm, and the wheelbase is 1341 mm. The seat height is 790 mm, and the weight of the motorcycle is 146 kg (dry) and 154 kg (wet). The oil capacity of the motorcycle is 2.0 L, and its fuel capacity is 12 L. The braking distance at 48 km/h is 11 m and at 97 km/h is 37 km or 121 ft. The motorcycle has a top speed of 153 km/h or 95 mph.

---

Technical specifications:

Make Model: Yamaha R5-B 350

Year: 1971

Engine/frame Numbers: R5-015101 – 042209

Engine: Piston port two stroke, parallel twin cylinder.

Capacity: 347 cc / 21.2 cu in

Bore x Stroke: 64 54 mm

Compression Ratio: 7.5:1

Cooling System: Air cooled

Oil System: Oil injection

Induction: 2 x Mikuni VM28 SC carburetors

Ignition: Battery, dual coils, breaker points

Starting: Kick

Max Power: 26.8 kW / 36 hp @ 7000 rpm

Max Torque: 37.9 Nm / 3.87 kgf-m / 28 ft-lb @ 6500 rpm

Clutch: Multi-plate, wet

Transmission: 5 Speed

Final Drive: Chain

Gear Ratios: 1st 19.57 / 2nd 12.15 / 3rd 9.12 / 4th 7.38 / 5th 6.16:1

Frame: Duplex cradle frame

Front Suspension: Telescopic fork

Rear Suspension: Swingarm

Front Brakes: Drum, twin leading shoe

Rear Brakes: Drum, single leading shoe

Front Tyre: 3.00-18

Rear Tyre: 3.50-18

Dimensions: Width: 739 mm / 29.1″

Wheelbase: 1341 mm / 52.8″

Seat Height: 790 mm / 31.1″

Footpeg Height: 234 mm / 9.2″

Ground Clearance: 180 mm / 7.1″

Dry Weight: 146 kg / 322 lbs

Wet Weight: 154 kg / 340 lbs

Oil Capacity: 2.0 L / 4.2 US pts

Fuel Capacity: 12 L / 3.2 US gal

Average Fuel Consumption: 6.7 L/100 km / 14.9 km/l / 35 US mpg

Braking 48 km/h / 30 mph – 0: 11 m / 36 ft

Braking 97 km/h / 60 mph – 0: 37 km/ 121 ft

Standing 1/4 Mile: 15.5 sec / 130 km/h / 81 mph

Top Speed: 153 km/h / 95 mph

Source: Motorcycle Classics