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Yamaha YCS1 180 Bonanza Official PosterTechnical Specifications of Yamaha YCS1 Bonanza 

Model: Yamaha YCS1 180

Versions: YCS1, CS1, CS1-C, CS1-E

Year: 1967-69

Motorcycle Type: Street scrambler

Dry weight: 119 kg

Ground clearance: 170 mm (6.7 inches)

Fuel tank size: 11.4 litres (3.3 gallons)

Colour options: Candy Blue, Candy Red & Black


Engine, Intake & Transmission

Displacement: 180cc

Engine: Parallel twin, two cylinders, two-stroke

Top speed: 130 km/h (80 mph)

Fuel system: Carburettor

Ignition: Points

Lubrication system: Autolube system

Cooling system: Air cooled

Gearbox: 5-speed

Transmission: Chain

Start up: Electric start & Kick-start


Chassis, suspension, brakes and wheels

Frame type: Steel tube – single downtube

Front suspension: Telescopic fork

Rear suspension: Dual shocks

Front brakes: Drum brake

Rear brakes: Drum brake

Yamaha YCS1 Bonanza Parts 

We all at Sumo Rubber understand the challenges in keeping these old bikes up and running. As motorcycles develop, so do parts and some are just not economical for Yamaha to produce. This is where we step in and offer you quality reproduction Yamaha YCS1 spare parts to help you service and restore your CS1 Bonanza motorcycle. 

We stock a growing selection of Original Equipment Manufacturer parts as well as a variety of pattern motorcycle parts. The best way is to search either by the OEM number or browse the dedicated category for your model. If you can't find the item, you are looking for, please contact us.