Yamaha YDS7 (1966-67)

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

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