Yamaha XJ 650 Seca (1981) vs Yamaha RD 350LC YPVS Kenny Roberts Signature (1983)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XJ 650 Seca | RD 350LC YPVS Kenny Roberts Signature |
| Years: | 1981 | 1983 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder, | Two stroke, parallel twin cylinder |
| Capacity: | 653 cc / 39.8 cu-in | 347 cc / 21.1 cu-in |
| Bore x Stroke: | 63 х 52.4 mm | 64 х 54 mm |
| Cooling System: | Air-cooled | Liquid cooled |
| Compression Ratio: | 9.2:1 | 6.2 :1 |
| Induction: | 4x 32mm Hitachi carburetors | 2x 26mm Mikuni slide-needle carburetor |
| Ignition: | Transistorized | Flywheel magneto CDI |
| Starting: | Electric | Kick |
| Max Power: | 71 hp / 51.8 kW @ 9400 rpm | 59 hp / 43.9 kW @ 9000 rpm |
| Max Torque: | 57 Nm / 42 lb-ft @ 7500 rpm | 40.2 Nm / 4.1 kgf-m / @ 8000 rpm |
| Clutch: | Wet Multiplate; 7 Steel 8 Friction | Wet multiplate |
| Transmission: | 5 Speed | 6 Speed |
| Final Drive: | Shaft | Chain |
| Frame: | Tubular steel dual cradle frame | Tubular mild steel, double front downtubes |
| Front Suspension: | 36mm Kayaba forks | 32mm stanchion tube forks |
| Rear Suspension: | Duel Kayaba shocks | Single shock cantilever 5-way adjustable spring preload |
| Front Brakes: | 2x 268mm disc 1 piston calipers | 2x 267mm disc 1 piston caliper |
| Rear Brakes: | Drum | Drum |
| Front Tyre: | 3.25-19 | 3.00-18 |
| Rear Tyre: | 120/90-18 | 3.50-18 |
| Wheelbase: | 1445 mm / 56.8 in | 1365 mm / 53.7 in |
| Seat Height: | 780 mm / 30.7 in | 785 mm / 30.9 in |
| Ground Clearance: | 145 mm / 5.7 in | 165 mm / 6.4 in |
| Dry Weight: | 206 kg / 465 lbs | 143 kg / 315.2 lbs |
| Fuel Capacity: | 19.5 Litres / 5.1 US gal | 16.5 Liters / 4.3 US gal |
| Consumption Average: | 48.6 mpg | 43 mpg |
| Standing ¼ Mile: | 12.6 sec. / 171 km/h | 13.5 sec / 99.4 mph |