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Yamaha YDS-3C

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Make Model

Yamaha YDS-3C

Year

1966 - 67

Engine

Two stroke, piston-port, parallel twin, Crankshaft supported in four roller bearings; needle-roller small-end and big-end bearings. Light-alloy cylinder head;

Capacity

247 cc / 15.0 cu-in
Bore x Stroke 56 x 50 mm
Compression Ratio 7.5;1
Cooling System Air-cooled

Induction

2x Mikunis VM24SC with air filter. Direct-operating, coupled air slides.

Ignition 

Generator 
Starting Kick
Electrical Equipment: Mitsubishi 65-watt dc generator charging six-volt battery through automatic voltage regulator. Coil ignition. 6in-diameter headlamp with pre-focus light unit; 35/35-watt main bulb.

Max Power

24 hp @ 7500 rpm

Max Torque

18.1 ft-lb 4.2 kgf-m @ 7500 rpm
Clutch Wet, multi-plate clutch mounted on left side of crankshaft

Transmission 

5 Speed  Helical-gear primary drive. Rear chain % x %in with top guard. Engine rpm at 30 mph in top gear, approximately 2,500. 
Final Drive Chain
Gear Ratio 1st 2.545  2nd 1.533 3rd 1.167  4th 0.950  5th .0773

Front Suspension

Telescopic forks with hydraulic damping.

Rear Suspension

Dual shocks swinging arm, Pivoted rear fork controlled by spring-and-hydraulic units with three-position adjustment for load.

Front Brakes

Drum

Rear Brakes

Drum

Front Tyre

3.00 -18

Rear Tyre

3.25 -18
Dimensions 

Length 2006 mm / 79 in 

Width  792.5 mm / 31.2 in 

Height 1066.8 mm / 42 in

Wheelbase 1470.5 mm / 51.9 in

Wet Weight

145 kg / 320 lbs

Fuel Capacity 

11.4 Litres / 3.0 gal